for (NSUInteger i = 0; i < [arrFields count]; i ++) {
        id contentValues = [[arrFields objectAtIndex:i] objectForKey:@"failvalues"];
        id contentFields = [[arrFields objectAtIndex:i] objectForKey:@"fieldvalue"];
        if ([contentValues isKindOfClass:[NSArray class]] && [contentFields isKindOfClass:[NSArray class]]) {
            NSSet *values = [[NSMutableSet alloc] initWithArray:contentValues];
            NSSet *fields = [[NSSet alloc] initWithArray:contentFields];
            [values intersectsSet:fields];
            NSLog(@"Values: %@", [values allObjects]);
        }
    }