C11111333133313232233133313331333133313331312111133133312111111331333112121   >>    C1111133313331323223313331333133313331333131211113313331211111133133311212   <<    C11111333133313232233133313331333133313331312111133133312111111331333112123   >>      C11111333133313232233133313331333133313331312111133133312111111331333112122   >>