Most difficult class you ever took?

[pokerfan]

For me it was a graduate level class in nonlinear systems. I survived, but to this day, I don't completely understand it.

I also flunked my second semester (integral) calculus midterm, which was more of a wakeup call. I rebounded and aced the remaining exams. For the next three years, Professor Newton (heh!) would always smile at me when we passed each other on campus.

[CatholicEdHead]

1. Advanced Differential Equations

[Jimbo S]

72. Diff equations is the easiest of the calculus classes.

If I remember right, any diff equation can be solved with one of just three methods to pick from.

[Lyric]

2. Theatre Tour, just this past semester.

We were analyzing plays as literature, and since I had no familiarity with that genre of writing, it took me a while to really understand it. I got an A, though, so I guess it wasn't THAT hard.

:hi:

[CreekDog]

3. Calculus

Every assignment threw me a curve. :hide:

[pokerfan]

9. That's pretty bad

I hate derivative humor. ;)

[Dr. Strange]

24. I didn't care that much one way or the other.

I was pretty indifferential.

[Pierre.Suave]

20. ROFL

Nice... :P

[falcon97]

4. Logic ;)

Actually, 2 of my friends wanted to take a meteorology course...because who among us doesn't want to know how those TV people predict what the weather will be. They ended up in the section for majors. The semester did not go too well for them.

[wickerwoman]

5. Ancient Greek 101 and 102

Fourteen years on, all I can remember is the alphabet.

The optative mood can kiss my royal Irish ass.

[pokerfan]

10. Ancient languages...

Latin's a dead language,
As dead as dead can be.
It killed off all the Romans,
And now it's killing me.

[no name no slogan]

18. Latin 101, as a college freshman

I'd had three years of Spanish in high school, and thought I'd probably pick up on Latin fairly easily. How wrong I was. It was the only class I ever dropped in college. I'd study it 2 1/2 hours a night and was still getting Cs and Ds on the daily quizzes. x(

[Critters2]

43. For me it was Hebrew. My brain just doesn't think from right to left. nt

[Pacifist Patriot]

96. I struggled with Russian. I can remember a few words but not even the entire alphabet.

St. Cyril can kiss my royal Scottish ass.

[Posteritatis]

113. My Greek class was horrible in the great way

Started with 40 students, only four of us made it to the final.

It was taught by this scary, stereotypical-looking Russian Orthodox priest, nicknamed Ivan the Terrible by the faculty, who knew two dozen ancient and modern languages to some degree of fluency. He also occasionally tripped up on which language he was supposed to be speaking points; start writing out a Greek phrase on the board in Arabic, notices the mistake, grumbles at himself in Hebrew...

I loved the course, but did it ever kick my ass.

[Tuesday Afternoon]

6. Calculus -

I would understand it just fine but, come test day :wtf:

[Inchworm]

49. seconded

I did ok, but it was just.. "get a grip of it until test is over"

:crazy:

[pokerfan]

62. Ah, calculus is where math begins

[Tuesday Afternoon]

84. Looks like Art to me --

beautiful! :D

[Inchworm]

86. LoL

I first got lost in the numbers then thought the same thing. It's perdy. :rofl:

:hi:

[Kali]

68. same

3 tries, even the one semester "easy" version for nursing students. My first and major instances of test anxiety. To the point of almost not knowing my own name. It was weird.

[Tuesday Afternoon]

85. It was weird.

I would so totally get it and really think I understood it. Then come test day...:wtf:

[Bertha Venation]

7. Old Testament.

Even when I was a fundy, it was hard to study something so irrelevant so seriously. :eyes:

[DS1]

8. Staying awake through tank school

I think I stood for about 60% of it to not fall asleep. Holy shit that was a slow class lead by some dumb motherfuckers!

[The Velveteen Ocelot]

11. A couple of law school courses:

Federal jurisdiction and secured transactions.

:scared:

[pokerfan]

16. Law

Law is sophistry.

:hide:

[The Velveteen Ocelot]

17. Maybe so...

But that doesn't mean it can't be mind-destroyingly difficult.

[blue_onyx]

12. Physics

I took AP calculus and physics my senior year of high school. This made me think I could handle the regular "physics" in college rather than the "intro to physics" class. I got a C+ with the curve (I would have gotten a D otherwise).

[Mike 03]

13. It was without doubt a filmmaking class. I was in film school and this is the

class that "washes out" anybody who can't survive.

We had to make five movies in three and one quarter months--five movies that were good enough to please two professors and the twenty-some classmates we each were in competition with.

It was also the most expensive class I've ever taken, because it was costly to make these films. They were shot on celluloid and edited by hand.

I think it was also a test to see if we could survive for one semester on virtually no sleep.

But it was the best time of my life.

[rcrush]

81. That actually sounds like a lot of fun.

[Lucian]

14. Calculus.

[MorningGlow]

15. Statistics

I can't even balance my checkbook, so anything with numbers fried my brain.

[Release The Hounds]

58. I burned my Statistics textbook when the class was done so I could send it back to hell.

[Pierre.Suave]

19. German

not because german was hard, but because the Teacher was mean as hell...

it was the class that almost cost me my scholarship.

[Reverend_Smitty]

21. Chemistry

I'm not really a science/math person but it was a required class for my major and waited until my last semester of college to take it. The fact that I managed to not take any math classes in college and that I remembered next to nothing from high school algebra caused me to struggle mightily figuring out problems. I kicked ass in Anatomy and Biology, and did reasonably well in Physics but Chemistry caused night terrors.

I managed a B- in the class because of a good showing on a take home exam and labs plus he curved the grades like a mofo...I probably earned a C-...and I had one of the better "raw" grades in the class. He used to write down all the scores that people got on the exams on the chalk board just to see how you did compared to the rest of the class and I swear one time someone got a 12% out of 100!

I did much better in my Shakespeare class that semester :P

[rug]

22. A one credit class on the Rule Against Perpetuities.

[The Velveteen Ocelot]

28. No future interest is valid unless it vests no later than 21 years after

a life in being when the interest was created.

Simple.

Or go rent the movie "Body Heat." The key to the mystery is the Rule Against Perpetuities.

[rug]

55. Frozen embryos have given new life to litigating this Rule.

[The Velveteen Ocelot]

57. You just gave me a headache.

So the interest would never vest as long as the frozen embryo stayed frozen.

[grace0418]

23. Advanced calculus.

I was going to be an architect and had to take it. It's funny, I was quite good at geometry and trig, but calculus threw me. It was my only "C" in my entire educational career. I think it was only one of two semesters I didn't get straight "A"s in college.

[pokerfan]

25. Calculus for Architects?

That kind of blows my mind. But calculus is necessary to understanding physics and architects must deal with physical constraints so I guess I can see that.

[grace0418]

50. Well, I ended up a graphic designer so

it didn't do me much good except help me realize I did NOT want to be an architect.

[Dr. Strange]

26. Algebraic Number Theory

Not that it was the toughest material--but the courses that had the really hard material were seminar courses, so you could skate by with minimal understanding.

[Eyerish]

27. Psych Stats....

which kinda sucked because I was a psych major...

[Midlodemocrat]

34. Go you one better. I hated that fucker and I got my doctorate in psych.

That class was the death of me.

[bigwillq]

29. A few science courses

I hate science. Well, I did when I was in school. I find it more interesting now.

[flvegan]

30. My last Sports Nutrition Cert course sucked.

Try being a vegan in one of those. No, seriously.

[LeftyMom]

31. Just continually update this with whatever my most recent math course was.

:eyes:

[pokerfan]

32. Math is terrible and beautiful at the same time (nt)

[LeftyMom]

33. I'm dreadful at it. And I really don't need it for my discipline, so it's hard to be motivated.

[pokerfan]

35. I find it fascinating

It's so.... elemental.

[LeftyMom]

36. Comm studies is so far to the left of that line you'd need another panel to see it.

:rofl:

It's a very squishy discipline, I must admit.

[KitchenWitch]

37. Toss up between Physical Chemistry and second semester Physics.

[Mike 03]

48. I HATED high-school chemistry. I did the final test out of order and didn't even

know it.

Physics, I have to admit, really turned me on.

[KitchenWitch]

54. My brain is wired for Chemistry.

Never took it in high school but aced it in college. Biology is another story. I had a difficult time with the 5 different sets of nomenclature in Biology. Loved Genetics. Had a difficult time with everything else.

[InvisibleTouch]

38. Several contenders...

...for different reasons. The ones that come to mind are Stratigraphy, Microbiology, the undergraduate Physics series, and Vertebrate Evolution. I did manage to pull off A's in all of them, but it was a struggle.

You'd think Stratigraphy would be a fascinating subject - the study of how to interpret sedimentary rock layers and see what kind of ancient environment produced them - but the teacher I had was so mind-numbingly boring that I could barely stand it. Nice guy, knowledgeable guy, but completely unable to infuse passion into his subject. Drove me to doodle on the desk for the first time since early grade school.

Microbiology had much the same problem as the above - a knowledgeable prof who absolutely could not convey his subject clearly. My only hope was the take notes like crazy during the lectures to catch every word, and then try to make sense of it later with the help of the book.

The 3-course undergrad Physics series had somewhat of the opposite issue - the prof was energetic and engaging and very approachable. He insisted upon being called by his first name rather than Dr-so-and-so, and he made no secret of the fact that he was a dedicated liberal. But he was of the mind that one should make the tests impossible, and then curve the hell out of the results. I've never known anyone who could make multiple-choice tests so absolutely convoluted. It's a little demoralizing when you go to get your grade and find you have a 60-something ... until you realize, on the curve, that's an A.

Finally Vertebrate Evolution. Loved loved loved the lecture part of the course, though there was a huge amount of info, and it wasn't easy stuff, but since I had a passion for the subject, I completely devoured it. Lab section was something else again. It was all dissection (lamprey, shark, cat), and the TA was utterly not helpful. When we asked questions he'd frantically page through the lab manual to see if he could find the answer, rather than being able to point out the structure we were asking about. I was doing well in the lecture part but not-well in the lab, and the final grade was determined by an average of both. I was seriously worried about that, until I pulled off a 100% on the final, which nudged me just over the edge into an A. For weeks afterward I had dreams about that class - that I'd be walking into the final exam and trying to protest, "But I already got 100 on this, and I can't pull that off again!"
Ultimately this class would also qualify as one of the most enjoyable that I had. And irony of ironies, I ended up teaching the lab section of a nearly identical course in grad school, for quite a number of years. I like to think I was more helpful to my students than the TA I had!

[Lyric]

70. Ha! I had a professor just like yours!

This guy: "The 3-course undergrad Physics series had somewhat of the opposite issue - the prof was energetic and engaging and very approachable. He insisted upon being called by his first name rather than Dr-so-and-so, and he made no secret of the fact that he was a dedicated liberal. But he was of the mind that one should make the tests impossible, and then curve the hell out of the results. I've never known anyone who could make multiple-choice tests so absolutely convoluted. It's a little demoralizing when you go to get your grade and find you have a 60-something ... until you realize, on the curve, that's an A."

Mine was a Political Science professor, and the class was State and Local Government. My GOD his exams were hard--multiple choice, but crazy-convoluted. He'd ask a question with several answers and then the multiple choices would all be "Just A, Just C, A & B but NOT C, B & C but NOT A, or None of the Above"

If not for his insane curving, nobody would have ever passed that class. I regularly got the highest scores in the class, and even MY exams would only have been B's and C's without the curve.

I loved him anyway, though--he was entertaining as hell, incredibly dry and witty, and VERY liberal in a stealthy kind of way. He never outright-stated his political persuasion, but it was no accident that all of the examples he used in class to demonstrate stupid mistakes made by state or local officials were ALL conservatives.

:rofl:

I'm taking him again next semester for "The Politics of Economic Policy." It's gonna be great. :)

[PfcHammer]

39. Compressible fluid mechanics

Went in knowing nothing, came out knowing nothing

[pokerfan]

64. Fluids are incompressible

Class over.

[chemenger]

98. Sorry! You're incorrect.

Liquids and gases are both considered fluids.

Liquids are generally considered to be incompressible. Gases on the other hand are very compressible.

[NOW tense]

82. Fluid Power

it was applied and theoretical pneumatics and hydraulics

[surrealAmerican]

40. I think it was called "Intermediate Modern Dance".

It was taught by an "artist in residence", and was so physically demanding much of the class dropped out in the first few weeks. We also had to remember long sequences of moves, which was difficult for me.

[mikeargo]

41. I've had classes...

in Calculus and Advanced Statistics, which I aced, but when I had a class in Blueprint Reading at a manufacturing company I was working at, I had a really hard time.

[XemaSab]

42. Botany

I never want to see another lichen again. x(

[jdp349]

44. Honors Advanced Quantum Nuclear Biomedical Chemical Non-linear Differential Basket weaving.

[Midlodemocrat]

45. Dude. Please. We're talking core here, not electives.

:eyes:

Welcome to DU!

[kedrys]

46. Physical chemistry - both semesters

Took it my senior year and understood the bumper sticker I'd seen after my junior year - "Honk if you passed PChem!" :rofl:

I got Bs. Whew.

[noamnety]

47. An applied research/statistics class

Our professor left the country halfway through the semester - and didn't tell any of us. We spent a lot of time going WTF ... where's our teacher ... um, I guess we should do the next chapter? The school never formally told us where our professor disappeared to.

Most of us didn't understand the material. My husband the electrical/optics engineer, who has tutored calculus before, tried doing it so he could explain it to me - he ended up taking it to work to have a guy with a doctorate in math help him.

Two weeks before the end of the class, a new professor arrived and stated he was our teacher now. His first question to us: "I don't see where the previous professor has any grades here ... any of you guys have emails from her letting you know your grades on the previous assignments?" He was never able to help us with the material because he was so far behind trying to fix our grades before the end of the term.

[SeattleGirl]

51. Undergrad statistics. It was so difficult for me that I decided to

take Statistics II, even though it wasn't required. (Yes, sometimes I AM a masochist!)

[Xipe Totec]

52. Structural stability of dynamical systems n/t

[baldguy]

53. Definitely Calc II

Never saw the assigned professor. The class was arbitrarily divided into 3 sections, each covered by a graduate TA. The first was a Chinese girl who spoke no English. The second was an Arab whose accent was incomprehensible. And the third was an Asian guy who never spoke. He wrote assignments on the board, and half the time he read a newspaper or worked on his own dissertation. The other half he didn't even show up - other than to assign work.

[sammythecat]

56. Latin II

Incredibly difficult when you don't know Latin I.

[Tuesday Afternoon]

89. how did you even get in the class without the prerequisite?

:D :shrug:

[sammythecat]

97. Oh, I passed Latin I

but I shouldn't have. I got a 70, but it should have been a 50. I was totally unprepared for Latin II. I had to take a summer remedial course in Latin II to get my diploma.

I wish I would have made more of an effort to learn it though. I certainly don't regret knowing the little that I do know. It's certainly not necessary knowledge, but it is useful at times. Plus, it'd just be cool to know Latin. I don't, and I ain't. :(

[femmocrat]

59. I avoided all those classes in order to keep a high QPA!

As I've said before, I'm basically lazy.

And I was too busy having fun to study that hard.

[Jean Louise Finch]

60. Bayesian statistics

Ooof. I'm in the middle of it right now ... four weeks to go, and I have just completely lost the thread.

Should be working on my problem set right now!

[rucky]

61. Fucking Pre-Columbian Art History

that was supposed to be my blow-off class that semester!

[Tikki]

83. My favorite class outside of my Major...

I scour the internets looking for an online Pre-Columbian Art History class...

Tikki

[Coventina]

110. What? You couldn't tell the Olmecs from the Zapotecs from the Toltecs from the Mixtecs

from the Aztecs?

:-)

[Manifestor_of_Light]

63. Five years of law school. 90 Semester Hours.

I worked and went to law school at night. I could only take 8 to 10 semester hours at a time. That's why it took five years. A few of the courses were easy, but the rest was mindblowingly hard.

And I grew up with a father who was a lawyer, a mother who was a legal secretary, and I was a court reporter!! I thought I knew this stuff. But it was very difficult.

Some of it is incredibly boring as well, like Bills & Notes, Sales & Secured Transactions, and Contracts (9 months).

I dropped Estate & Gift Tax because it blew my mind. I couldn't deal with it. It was an elective.

Evidence and Texas Civil Pre-Trial Procedure, Texas Civil Trial and Appellate Procedure, and Criminal Procedure were easy for me because I worked at the courthouse. You can't understand Evidence and Procedure unless you see it in action in court.

That said, the hardest undergrad course I took was Histology. I thought I was stupid, but I found out later that Histology is a medical school course, not an undergrad biology course. Studied my ass off and made a D.

[pokerfan]

65. Five years of sophistry

I don't mean to trash law but can you not make a legal argument for anything? Isn't that part of your training?

[Manifestor_of_Light]

71. What? Io non capisco. No comprende.

In law school you learn a different way of thinking. It's not like scientific reasoning where there is one right answer.

You learn that with the legal question within a given fact situation, there are TWO possible answers. And either of them could be right. The logic in the process used to get to the decision is more important than the decision itself.

So everything has two sides. Is that clear?

There are also TONS of memorization. Laundry lists of things like: The intentional torts. Various tests for constitutionality. The conditions of a negotiable instrument.

The fatal defects in indictments. The non-fatal defects in indictments. And on and on. Those are just the ones I can call to mind immediately, and I graduated 25 years ago.

[MilesColtrane]

66. Finance

I took it as an elective and it was difficult because I hadn't taken any of the prerequisite accounting and economics courses for it. I had to scrape my brain to remember what little calculus I had taken years before in high school.

Also, I was taking fourteen hours of music classes and labs AND trying to practice and learn how to play during that time.

I passed it with a B.

[Muttocracy]

67. Organic Chemistry

I did well in and loved inorganic and physical. Organic seemed like all memorization and the teacher really taught to the top 5 students in the class. I think it was the only class in WAY too many years of school where I just gave up. Teacher also had a strong foreign accent, went super-fast, and the means on his exam (honors chem students) were in the 40s to 60s.

It helped make my career decision, though I wonder now how a different teacher would have changed my direction in life.

[GaYellowDawg]

109. Same here.

I had an easier time with biochem on the doctoral level than I did organic at the undergrad. That said, I was a piss-poor student as an undergrad.

[DarkTirade]

69. Wasn't a whole course, just a quarter of a weird math class that the state of FL foisted on us.

But statistics really fucked me over good. I'm not sure why. It seems so simple. But for some reason I just wasn't getting it.

The first half of the class was algebrae. The next quarter was geometry. Stats was only the last quarter.

And yet my grade went from an easy B+/A all the way through the first three quarters of the class, down to a D. I had to take the final exam just to get my grade back up to passing. And I spent the first three quarters of the class goofing off and never doing my homework. I spent the last quarter working my ass off.

I suspect it was just a bad teacher. Maybe I'd be able to do it if I had a teacher who could explain it to me properly. But I'm a wee bit afraid to try, on the off chance that it was just me.

[Jimbo S]

73. Statics. Curcuits.

The statics prof was perenially voted the worst on the engineering campus.

Electrical engineering I could never get a handle on, and I ended up taking two semesters.

[pokerfan]

87. Statics just clicked for me

Had the benefit of a great text and a good prof. Circuits was just tedious. Solving RLC circuits with convolutions was infuriating especially since I had read ahead and knew about Laplace transforms. For some reason they felt that it was important that we do it the hard way first.

[PfcHammer]

101. I used Beer & Johnston Vector Mechanics for Engineers

the black text with a bridge on the cover. very good.

[EFerrari]

74. Trig. As soon as that plane turned left in SPACE, they lost me.

:(

[travelingtypist]

75. 1st year college chemistry.

I worked harder for those two C-pluses than I did on
any of my the As I got in English and philosphy. If
was horrible.

[Strong Atheist]

76. Two. Cobol was the most boring. Couldn't stay awake. Teaching Elementary English

was the hardest. I can not multitask AT ALL, much less to the extent they want you to today...:scared:

[Tikki]

77. Stats...not my forte'...as they say.....

Tikki

[HamdenRice]

78. Corporate Tax. The prof would describe a transaction. Everyone would close their eyes...

to try to imagine it and the tax consequences.

It was weird. It was very Zen. Almost like meditation.

Or three dimensional analytic geometry.

[Rising Phoenix]

79. Math and computer programing

this makes me sound very old, but I took it freshman year in college, before every person had a computer, so it was really hard. I basically learned how to program gambling games......waste of time. I got a C, but failed every test. I never missed a class though.....hence C that and a wicked curve. To illustrate just how hard this class was....a story.....We had a homework assignment, probablilites.....I couldn't do it, so I went down the hall to Peter's room. He was a nuclear physicist major, and a math minor. I begged him for help. Figuring it would take him a few minutes, he agreed. Several hours later a stressed peter returned my finished homework. I turned it in. He got a 50 % an F.......he was ripshit.

[guitar man]

80. Airframes II

When I was going to school to get my A&P license. I had just come off a job where I was bending a lot of large pieces of heavy sheet steel and I had absolute hell adjusting to the light aluminum we were using. I tore up a lot of pieces trying to get it right. My riveting really sucked ass too :(

[Commie Pinko Dirtbag]

88. Abstract Algebra.

Group Theory was my first under-5 grade, ever. I felt like I was hit by a train.

[TZ]

90. A tie

Between 1st semester Calculus,second semester Organic Chem and second semester Physics...I still have nightmares about the polymers from organic chem though...20 years later I still shiver over having to memorize the equations for making nylon....:scared:

[JustABozoOnThisBus]

91. Accounting

Incredibly boring. I hated it. And I didn't exactly "get it".

[applegrove]

92. Matrix Linear Algebra. I took the course 3 times before I passed. I just couldn't compute.

[Orsino]

93. Thermodynamics.

Fascinating and deadly. I referred to it as "βθηgA," in geek-speak homage to the old "death or bonga" joke.

Thermogoddamics is one of those legendary hurdles facing a student. As with physical chemistry for the chem majors, and differential equations for the mathists, a lot of physics majors remember Thermo as the toughest ordeal. It certainly was for me.

[Manifestor_of_Light]

108. Thermogoddamics.

Yes, my BF who has a BS and MS in math/physics said the same thing.

Boring as hell but required.

He also had a prof that said "Don't read the chapter on relativity".

That was like saying to him "Don't look at that girlie magazine". :D

[RoadRage]

94. Business Law 1 - 3

I could barely keep my eyes open....

[Pacifist Patriot]

95. Literary Criticism

I did so well in a History of the English Language course the bloody professor talked me into talking Literary Criticism. A course clearly designed for English majors which I was not. I thought I was going to get to read stuff and rip it apart. Not exactly. I withdrew with an Incomplete before I could fail utterly and spectacularly.

[UrbScotty]

99. Empirical Methods of Political Research

Required for all Poli Sci majors. Advanced stats. Chi square tests. It's a shock that I got an A-.

[Pacifist Patriot]

100. Poli Sci major here who lucked out big time!

For our stats requirement, I ended up with a brand new professor fresh out of grad school. He reasoned that 50 was halfway between 0 and 100 so a 50 must be a C. I got a B- in the course.

[elshiva]

102. Graduate Level Worship & Liturgy

The most difficult class I ever took because the professor was a complete asshole to all the students. One of the many reasons I dropped out of Grad School.

[skooooo]

103. 4th year russian

[AwakeAtLast]

104. Any class in which the professor wrote the book

For me that included conducting, choral methods, and a psychology class. Arrogant, sexist professors didn't help either. x(

[midnight armadillo]

105. Graduate level in physics Electricity & Magnetism II

Once we starting doing contravariant and covariant matrices for handling relativistic electrodynamics I really had to scramble to keep up. I never retained that stuff after the class ended either.

Canonical transforms from Classical Mechanics also sort of mystified me.

Good times.

[Flying Dream Blues]

106. Graduate level Microeconomics with Dr. Young. Total intimidatiion...the kind

of professor who wrote with his right hand while erasing with the left hand. You could smell the fear in the room in the final exam which was 50% of our grade...

:scared:

[cloudbase]

107. Materials Science.

Not because the subject was all that difficult, but it was taught by a Korean professor who spoke with such a heavy accent that it was almost impossible to understand him.

[av8rdave]

111. Several calculus classes in college

[snooper2]

112. semiconductor circuit analysis

nt

[Patiod]

114. I wouldn't have graduated without the Penn State Football Team

and finding out that a calculus course was offered Spring Term in the evening, and all the football players took it.

All of the test questions were true and false, and the class was graded on a curve where a 51% was a passing grade. And tacked on to the end of the calculus course was a chapter on matricies, which I grasped completely and immediately - the one test I got 100% on.

Thanks to matricies, I was able to pass Calculus I with something like a 55% average and absolutely NO UNDERSTANDING AT ALL of calculus, except that I think it calculates the area under a curve. Credit for Calculus II goes to a a dopey swimmer I was seeing at the time, but we won't go into that one either, except to say that I still escaped with no understanding of calculus.