C11111211113313112113313331333131133133313331323133313232221211   >>    C1111121111331311211331333133313113313331333132313331323222121   <<    C11111211113313112113313331333131133133313331323133313232221213   >>      C11111211113313112113313331333131133133313331323133313232221212   >>