C11111333133313232233133313331333133313331312111133133112111112111133132213211   >>    C1111133313331323223313331333133313331333131211113313311211111211113313221321   <<    C11111333133313232233133313331333133313331312111133133112111112111133132213213   >>      C11111333133313232233133313331333133313331312111133133112111112111133132213212   >>