C1111233131211111211113313331333133313231121133132313232233132211   >>    C111123313121111121111331333133313331323112113313231323223313221   <<    C1111233131211111211113313331333133313231121133132313232233132213   >>      C1111233131211111211113313331333133313231121133132313232233132212   >>