docs: public void readPOS(String path, String suffix, String charset) throws IOException {
  		List<File> files = MyFiles.getAllFiles(path, suffix);//".txt"
  		
  		Iterator<File> it = files.iterator();
  		while(it.hasNext()){
  			BufferedReader bfr =null;
  			File file = it.next();
  			try {
  				FileInputStream in = new FileInputStream(file);
  				bfr = new BufferedReader(new UnicodeReader(in,charset));
  			} catch (FileNotFoundException e) {
  				e.printStackTrace();
  			}
  			FNLPDoc doc = new FNLPDoc();
  			doc.name = file.getName();
  			
  			String line = null;
  			while ((line = bfr.readLine()) != null) {
  				line = line.trim();
  				if (line.matches("^$"))
  					continue;
  				FNLPSent sent = new FNLPSent();
  				sent.parseTagedLine(line);
  				doc.add(sent);
  			}			
  			add(doc);
  		}
  	}