Merge pull request #1 from y-tsutsu/master

test
solve ch04/ex2
Merge branch 'master' into ex2

Conflicts:
	ch04/exercises.hs
Merge pull request #1 from papamitra/ex2

solve ch04/ex2
Merge branch 'master' of https://github.com/minddnim/RWH_EX into minddnim-master

Conflicts:
	ch04/exercises.hs
Merge remote-tracking branch 'y-tsutsumi/master'