code: protected char[][] valuateInvertedNoteChars() {
  		short noteDuration = note.getStrictDuration();
  		char[] c1 = null, c2 = null;
  		if (note.isRest()){
  			c1 = new char[] { getMusicalFont().getRestChar(noteDuration) };
  		}
  		else {
  			if (noteDuration <= Note.HALF) {
  				if (isStemUp())
  					c1 = new char[] { getMusicalFont().getStemWithoutNoteUpChar(noteDuration) };
  				else
  					c1 = new char[] { getMusicalFont().getStemWithoutNoteDownChar(noteDuration) };
  			}
  			c2 = new char[] { getMusicalFont().getNoteWithoutStem(noteDuration) };
  			//if the note in valuateNoteChar is without stem
  			//remove the stem char (c1)
  			//e.g.: JChordNote, JNotePartOfGroup
  			if (c2[0] == noteChars[0]) {
  				c1 = null;
  			}
  		}
  		return new char[][] { c1, c2 };
  	}
docs: Sets the Unicode values of the stem [0] and the
  note head [1] for head inverted note
  @return char[2][]