fold-left[procedure] fold-left combine nil list1 ...
R6RS: If one list list1 == (e0 e1 ... eN) is given,
the result would be:
(combine (... (combine (combine nil e0) e1) ... ) eN)
If more than one list are given, combine takes as many arguments as the number of list plus 1. Lengths of all lists must be the same.
See also: fold-right, fold.
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