changes
Merge branch 'master' of github.com:HaskellForCats/HaskellForCats
Merge branch 'master' of github.com:HaskellForCats/HaskellForCats
Merge branch 'master' of github.com:HaskellForCats/HaskellForCats
Merge branch 'master' of github.com:HaskellForCats/HaskellForCats
commented out Data.Tree import