úÎä¤     (c) Fumiaki Kinoshita 2014BSD3'Fumiaki Kinoshita <fumiexcel@gmail.com> experimental non-portableNone &(1345>KL        eleva_I0XHPvuBaCqDB9MeTGOndvControl.ElevatorFloors1ElevateTowerFloorstoLofttoLoft1elevate$fTowerExceptT $fTowerListT $fTowerMaybeT $fTowerContT$fTowerWriterT$fTowerWriterT0$fTowerReaderT $fTowerStateT$fTowerStateT0 $fTowerUnion $fTowerST $fTower[] $fTower(->) $fTowerEither $fTowerMaybe$fTowerIdentity $fTowerIO