C1111233131211111211113313331333133313331312331333133313121112231121   >>    C111123313121111121111331333133313331333131233133313331312111223112   <<    C1111233131211111211113313331333133313331312331333133313121112231123   >>      C1111233131211111211113313331333133313331312331333133313121112231122   >>