C11112331312111112111133132313331333133313233313113313331333133322123321   >>    C1111233131211111211113313231333133313331323331311331333133313332212332   <<    C11112331312111112111133132313331333133313233313113313331333133322123323   >>      C11112331312111112111133132313331333133313233313113313331333133322123322   >>