NSDictionary *someDict = [NSDictionary dictionaryWithObjectsAndKeys: @"Foo", @"Bar", @"Fizz", @"buzz", nil];
        SomeObj *anObject = [[SomeObj alloc] init];
        [anObject setDictionaryRepresentation:someDict];

        NSDictionary *someOtherDict = [NSDictionary dictionaryWithObjectsAndKeys: @"Food", @"Biz", @"Bazzz", @"Fizzle", nil];
        SomeObj *anotherObject = [[SomeObj alloc] init];
        [anotherObject setDictionaryRepresentation:someOtherDict];

        NSDictionary *someDictionarySameAsSomeDict = [NSDictionary dictionaryWithObjectsAndKeys: @"Fizz", @"buzz", @"Foo", @"Bar", nil];
        SomeObj *someThirdObject = [[SomeObj alloc] init];
        [someThirdObject setDictionaryRepresentation:someDictionarySameAsSomeDict];


        NSPredicate *isEqualTemplate = [NSPredicate predicateWithFormat:@"dictionaryRepresentation = $SOME_DICTIONARY"];
        NSPredicate *filter = [isEqualTemplate predicateWithSubstitutionVariables:[NSDictionary dictionaryWithObject:someDict forKey:@"SOME_DICTIONARY"]];

        NSArray *easyOne = [NSArray arrayWithObjects: anObject, anotherObject, nil];
        NSArray *someFilteredObjects = [easyOne filteredArrayUsingPredicate:filter];
        NSLog(@"%@ ", someFilteredObjects);
        assert([someFilteredObjects objectAtIndex:0] == anObject);

        NSArray *harderOne = [NSArray arrayWithObjects: someThirdObject, anotherObject, nil];
        someFilteredObjects = [harderOne filteredArrayUsingPredicate:filter];
        NSLog(@"%@ ", someFilteredObjects);
        assert([someFilteredObjects objectAtIndex:0] == someThirdObject);


        NSArray *hardestOne = [NSArray arrayWithObjects: anObject, someThirdObject, anotherObject, nil];
        someFilteredObjects = [hardestOne filteredArrayUsingPredicate:filter];
        NSLog(@"%@ ", someFilteredObjects);
        assert([someFilteredObjects containsObject:someThirdObject]);
        assert([someFilteredObjects containsObject:anObject]);