map is:exact -package:text -package:dense-linear-algebra -package:base-prelude -package:case-insensitive -package:dlist -package:bytestring -package:ghc -package:containers -package:base-compat-batteries -package:imports -package:os-string -package:Cabal-syntax package:basement
Map all element a from a block to a new block of b
Map all elements in a list