.append(this.rank, rank)
.append(this.rank, rhs.rank)
  public boolean equals(Object obj)  {    if ( !(obj instanceof ChoiceImpl) )    {      return false;    }        ChoiceImpl rhs = (ChoiceImpl) obj;    return new EqualsBuilder()    	.append(this.displayOrder, rhs.displayOrder)    	.append(this.rank, rank)      .append(this.displayValue, rhs.displayValue)      .append(this.value, rhs.value)      .isEquals();  }