C1111233131211111211113313331333133313331122212111112111111223311121   >>    C111123313121111121111331333133313331333112221211111211111122331112   <<    C1111233131211111211113313331333133313331122212111112111111223311123   >>      C1111233131211111211113313331333133313331122212111112111111223311122   >>