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