C1111233131211111211113313331333133313331333133313331333133313222332121   >>    C111123313121111121111331333133313331333133313331333133313331322233212   <<    C1111233131211111211113313331333133313331333133313331333133313222332123   >>      C1111233131211111211113313331333133313331333133313331333133313222332122   >>