MathPHP\SetTheory\SetOperationsTest::dataProviderForPowerSet PHP Метод

    public function dataProviderForPowerSet()
    {
        return [[new Set(), new Set([new Set()])], [new Set([1]), new Set([new Set(), new Set([1])])], [new Set([1, 2, 3]), new Set([new Set(), new Set([1]), new Set([2]), new Set([3]), new Set([1, 2]), new Set([1, 3]), new Set([2, 3]), new Set([1, 2, 3])])], [new Set(['x', 'y', 'z']), new Set([new Set(), new Set(['x']), new Set(['y']), new Set(['z']), new Set(['x', 'y']), new Set(['x', 'z']), new Set(['y', 'z']), new Set(['x', 'y', 'z'])])], [new Set([1, [1, 2]]), new Set([new Set(), new Set([1]), new Set([[1, 2]]), new Set([1, [1, 2]])])]];
    }