code: @SuppressWarnings("unchecked")
  	public List seqLabeling(String data){
  		List<Sentence> obsvSeqs = dataReader.readString(data);
  		return labeling(obsvSeqs);
  	}
docs: labeling observation sequences.
  
  @param data list of sequences with specified format which can be read by DataReader
  @return a list of sentences with tags annotated