/usr/lib/s9fes/help/split is in scheme9 2010.11.13-2.
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1 2 3 4 5 6 7 8 9 10 11 12 | S9 LIB (split list) ==> list
Split a list into two, where the first one contains the leftmost
members of the list and the second one its rightmost members. When
the list has an odd number of members, the second list will hold
the extra member. Return a list of two lists:
(leftmost-members rightmost-members)
(split '(1 2 3 4)) ==> ((1 2) (3 4))
(split '(1 2 3 4 5)) ==> ((1 2) (3 4 5))
(split '()) ==> (() ())
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