mergeTwo (x:xs) (y:ys) = if x <= y then x:mergeTwo xs (y:ys) else y:mergeTwo (x:xs) ys
mergeTwo (x:xs) (y:ys) = if x <= y then x:mergeTwo xs (y:ys) else y:mergeTwo (x:xs) ys
mergeTwo (x:xs) (y:ys) = if x <= y then x:mergeTwo xs (y:ys) else y:mergeTwo (x:xs) ys