likes (x:x':x'':[]) = x ++ ", " ++ x' ++ " and " ++ x'' ++ " like this"
likes (x:x':x'':[]) = x ++ ", " ++ x' ++ " and " ++ x'' ++ " like this"
likes (x:x':x'':[]) = x ++ ", " ++ x' ++ " and " ++ x'' ++ " like this"