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    @Override
    public int hashCode() {

        final int prime = 31;
        int result = 1;

        result = prime * result + ((this.a == null) ? 0 : this.a.hashCode());
        result = prime * result + this.i;
        return result;
    }

    @Override
    public int hashCode() {

        return new HashCodeBuilder().append(this.a).append(this.i).toHashCode();
    }