map is:exact -package:text -package:containers -package:base -package:dense-linear-algebra -package:base-compat -package:aeson -package:hedgehog -package:base-prelude -package:insert-ordered-containers -package:amazonka-core -package:dlist -package:blaze-html package:basement
Map all element a from a block to a new block of b
Map all elements in a list