[plt-scheme] What's that function....

Is there a function in Scheme that takes in an arbitrary number of lists
(assuming they are of equal lengths) and then outputs a list of lists in
which all the firsts, seconds, thirds, etc. are grouped together?

Id est,

>(fn '(1 2 3 4) '(5 6 7 8) '(9 10 11 12))
'((1 5 9) (2 6 10) (3 7 11) (4 8 12))

I'm not sure how it exactly works but something along those lines. I think I
read about it somewhere. What's it's name again (if there is such thing)?

Thanks.

-- 
Chad Estioco
BS Computer Science (ongoing)
University of the Philippines-Diliman
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http://www.skytreader.net
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