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public Chunk seg(Sentence sen) {
        Chunk chunk = new Chunk();
        char[] chs = sen.getText();
        List<Word> cks = new ArrayList<Word>();
        for(int k=0; k<3&&!sen.isFinish(); k++) {
            int offset = sen.getOffset();
            int maxLen = 0;
            //有了 key tree 的支持可以从头开始 max match
            ArrayList<Integer> lens = dic.maxMatchs(chs, offset);
            maxLen = lens.get(0);
            for(int len:lens){
                if(len>maxLen){
                    maxLen = len;
                }
                cks.add(new Word(chs, sen.getStartOffset(), offset, len+1));
            }
            chunk.words[k] = new Word(chs, sen.getStartOffset(), offset, maxLen+1);
            offset += maxLen + 1;
            sen.setOffset(offset);
        }
        chunk.words = cks.toArray(new Word[cks.size()]);
        chunk.count = cks.size();
        return chunk;
    }