public override string ToString() {
StringBuilder sb = new StringBuilder("RelatedNotesScoreDoc(");
sb.Append("Note: ");
sb.Append(Note== null ? "<null>" : Note.ToString());
sb.Append(",Explanation: ");
sb.Append(Explanation);
sb.Append(",Score: ");
sb.Append(Score);
sb.Append(")");
return sb.ToString();
}