C1111233131211111211113313331333133313232321333133313332213232212131   >>    C111123313121111121111331333133313331323232133313331333221323221213   <<    C1111233131211111211113313331333133313232321333133313332213232212133   >>      C1111233131211111211113313331333133313232321333133313332213232212132   >>