C1111233131211111211113313331333133313232321333133313331333231322121   >>    C111123313121111121111331333133313331323232133313331333133323132212   <<    C1111233131211111211113313331333133313232321333133313331333231322123   >>      C1111233131211111211113313331333133313232321333133313331333231322122   >>