FOR-EACH : UTILITY

FOR-EACH is an utility.
(FOR-EACH mapfn varlist list1 ... listn form1 ...)
is an iteration macro which applied mapfn (if omitted MAP) to
list1 ... listn, binding in turn each variable in varlist, then
executing form1 ... It is roughly equivalent to
(mapfn #'(lambda varlist form1 ...) list1 ... listn)

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