C11112331312111112111133133313331333133313132211312111113213223331   >>    C1111233131211111211113313331333133313331313221131211111321322333   <<    C11112331312111112111133133313331333133313132211312111113213223333   >>      C11112331312111112111133133313331333133313132211312111113213223332   >>