C11111333133313232233133313331333131133131211113313221211331311233233221   >>    C1111133313331323223313331333133313113313121111331322121133131123323322   <<    C11111333133313232233133313331333131133131211113313221211331311233233223   >>      C11111333133313232233133313331333131133131211113313221211331311233233222   >>