C1111233131211111211113313331333133313232321333133313113323221211   >>    C111123313121111121111331333133313331323232133313331311332322121   <<    C1111233131211111211113313331333133313232321333133313113323221213   >>      C1111233131211111211113313331333133313232321333133313113323221212   >>