C1111233131211111211113313331333133313232321333133313133313121311   >>    C111123313121111121111331333133313331323232133313331313331312131   <<    C1111233131211111211113313331333133313232321333133313133313121313   >>      C1111233131211111211113313331333133313232321333133313133313121312   >>