C1111233131211111211113313331333133313311211111133132313232212121   >>    C111123313121111121111331333133313331331121111113313231323221212   <<    C1111233131211111211113313331333133313311211111133132313232212123   >>      C1111233131211111211113313331333133313311211111133132313232212122   >>