map is:exact -package:text -package:Cabal-syntax -package:dense-linear-algebra -package:containers -package:case-insensitive -package:charset -package:ghc -package:invertible -package:dlist -package:base-prelude -package:hedgehog -package:insert-ordered-containers package:basement
Map all element a from a block to a new block of b
Map all elements in a list