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public class Solution { class QuEle{ int cur; List li; QuEle(int cur, QuEle prior){ this.cur=cur; li=new ArrayList(); if(prior!=null) li.add(prior); } } void backtrace(QuEle buf, StringBuffer sb, List res,int end, String s){ int len=buf.li.size(); if(len==0){ sb.insert(0,s.substring(buf.cur,end)); String temp=sb.toString(); if(temp.length()!=0) res.add(temp); sb.delete(0,end-buf.cur); return; } if(buf.cur!=end){ sb.insert(0,s.substring(buf.cur,end)); sb.insert(0," "); } for(int i=0;i

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