Set<Attribute<?>> extraAttributes = new LinkedHashSet<>();
        for (ImmutableAttributes attributes : candidateAttributeSets) {
            extraAttributes.addAll(attributes.keySet());
        }
        removeSameAttributes(requested, extraAttributes);
        Attribute<?>[] extraAttributesArray = extraAttributes.toArray(new Attribute<?>[0]);
        for (int i = 0; i < extraAttributesArray.length; i++) {