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