C312312111133131212111133133313231333133313331323221211111232322221   >>    C31231211113313121211113313331323133313331333132322121111123232222   <<    C312312111133131212111133133313231333133313331323221211111232322223   >>      C312312111133131212111133133313231333133313331323221211111232322222   >>