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

        final Combination that = (Combination)o;

        if (!Arrays.equals(coins, that.coins)) {
            return false;
        }

        return true;
    }