@Override
    public boolean equals(Object o) {
      if (this == o) return true;
      if (o == null || getClass() != o.getClass()) return false;

      CommentRange that = (CommentRange)o;

      if (first != null ? !first.equals(that.first) : that.first != null) return false;
      if (last != null ? !last.equals(that.last) : that.last != null) return false;

      return true;
    }
@Override
    public boolean equals(Object o)