C1111233131211111211113313331333133313331333133313331333133313232112323211   >>    C111123313121111121111331333133313331333133313331333133313331323211232321   <<    C1111233131211111211113313331333133313331333133313331333133313232112323213   >>      C1111233131211111211113313331333133313331333133313331333133313232112323212   >>