C11112331312111112111133133313331333133313331333133313331211113313231232313221   >>    C1111233131211111211113313331333133313331333133313331333121111331323123231322   <<    C11112331312111112111133133313331333133313331333133313331211113313231232313223   >>      C11112331312111112111133133313331333133313331333133313331211113313231232313222   >>