docs: public static String[][] genSequence(String sent){
  
  		CharType[] tags = Chars.getType(sent);
  		int len = sent.length();
  		ArrayList<String> words = new ArrayList<String>();
  		ArrayList<String> types = new ArrayList<String>();
  		int begin =0;
  		for(int j=0; j<len; j++) {			
  			if(j<len-1 && tags[j]==CharType.L && tags[j+1]==CharType.L){//当前是连续英文
  				continue;
  			}else if(j<len-1 &&tags[j]==CharType.D && tags[j+1]==CharType.D){//当前是连续数字
  				continue;
  			}
  			StringType st = Chars.char2StringType(tags[j]);
  			String w = sent.substring(begin,j+1);
  			words.add(w);
  			types.add(st.toString());
  			begin = j+1;
  		}		
  		String[][] data = new String[2][];
  		data[0] = words.toArray(new String[words.size()]);
  		data[1] = types.toArray(new String[types.size()]);
  		return data;
  	}