C1111233131211111211113313331333133313232321333133313331333232121   >>    C111123313121111121111331333133313331323232133313331333133323212   <<    C1111233131211111211113313331333133313232321333133313331333232123   >>      C1111233131211111211113313331333133313232321333133313331333232122   >>