> +   @Override
> +   public int hashCode() {
> +      int result;
> +      long temp;
> +      temp = Double.doubleToLongBits(price);
> +      result = (int) (temp ^ (temp >>> 32));
> +      result = 31 * result + (subscriptions != null ? 
> subscriptions.hashCode() : 0);
> +      return result;
> +   }
> +
> +   @Override
> +   public String toString() {
> +      return "SubscriptionCalculator{" +
> +            "price=" + price +
> +            ", subscriptions=" + subscriptions +
> +            "} " + super.toString();

Why the `super.toString()`?

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