docs: public static String genSequence4Tags(String[] wordArray){
  		StringBuilder sb = new StringBuilder();
  		for(int i=0; i<wordArray.length; i++) {
  			String word = wordArray[i];
  			for(int j=0; j<word.length(); j++) {
  				char c = word.charAt(j);
  				if(Chars.getType(c)==Chars.CharType.B){
  					System.err.println(word + " :包含空格(将序列标签转为BMES)");					
  				}
  				sb.append(c);
  				sb.append('\t');
  				if(j == 0) {
  					if(word.length() == 1)
  						sb.append('S');
  					else
  						sb.append('B');
  				} else if(j == word.length()-1) {
  					sb.append('E');
  				} else {
  					sb.append('M');
  				}
  				sb.append('\n');
  			}
  		}
  		sb.append('\n');
  		return sb.toString();
  	}