C1111233131211111211113313331333133313331333131211113313311211331323132322121   >>    C111123313121111121111331333133313331333133313121111331331121133132313232212   <<    C1111233131211111211113313331333133313331333131211113313311211331323132322123   >>      C1111233131211111211113313331333133313331333131211113313311211331323132322122   >>