parentBuilder) {
    return MultisetTestSuiteBuilder.using(
            new KeysGenerator<K, V, M>(parentBuilder.getSubjectGenerator()))
        .withFeatures(computeKeysFeatures(parentBuilder.getFeatures()))
        .named(parentBuilder.getName() + ".keys")
        .suppressing(parentBuilder.getSuppressedTests())
        .withSetUp(parentBuilder.getSetUp())