docs: public String tagSeged2String(String[] src) {
  		StringBuilder sb = new StringBuilder();
  		String[] target = tagSeged(src);
  		if(target==null)
  			return null;
  		for(int j=0;j<target.length;j++){
  			sb.append(target[j]);
  			if(j<target.length-1)
  				sb.append(" ");
  		}
  		return sb.toString();
  	}