C1111233131211111211113313331333133313332213113121133132322123121   >>    C111123313121111121111331333133313331333221311312113313232212312   <<    C1111233131211111211113313331333133313332213113121133132322123123   >>      C1111233131211111211113313331333133313332213113121133132322123122   >>