C1111233131211111211113313331333133313231121133132313232233132211111   >>    C111123313121111121111331333133313331323112113313231323223313221111   <<    C1111233131211111211113313331333133313231121133132313232233132211113   >>      C1111233131211111211113313331333133313231121133132313232233132211112   >>