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