C11111211113313112113313331333133313133313232233133313121111113223111   >>    C1111121111331311211331333133313331313331323223313331312111111322311   <<    C11111211113313112113313331333133313133313232233133313121111113223113   >>      C11111211113313112113313331333133313133313232233133313121111113223112   >>