C1111233131211111211113313331323133313231121211113313331331122133313232212121   >>    C111123313121111121111331333132313331323112121111331333133112213331323221212   <<    C1111233131211111211113313331323133313231121211113313331331122133313232212123   >>      C1111233131211111211113313331323133313231121211113313331331122133313232212122   >>