map is:exact -package:text -package:base-compat-batteries -package:containers -package:dlist -package:ghc -package:incipit-base -package:hedgehog -package:blaze-html -package:insert-ordered-containers -package:monoidal-containers -package:foldl -package:imports package:basement
Map all element a from a block to a new block of b
Map all elements in a list