map is:exact -package:text -package:containers -package:insert-ordered-containers -package:foldl -package:case-insensitive -package:base-compat-batteries -package:blaze-html -package:aeson -package:base-compat -package:base -package:os-string -package:amazonka-core package:basement
Map all element a from a block to a new block of b
Map all elements in a list