http://haskell.org/ghc/docs/7.0-latest/html/libraries/haskell2010-1.0.0.0/Prelude.html
ʂ̃TCgɃWv悤ƂĂ܂BXΏL̃NNbNĂ
UPLIFTōLȂő̌܂傤IKȉ{Ct܂I