> +   @Override
> +   protected Function<Object, IterableWithMarker<SecurityGroup>> 
> markerToNextForArg0(Optional<Object> arg0) {
> +      String region = arg0.isPresent() ? arg0.get().toString() : null;
> +      final SecurityGroupApi securityGroupApi = 
> api.getSecurityGroupApi(region).get();
> +      return new Function<Object, IterableWithMarker<SecurityGroup>>() {
> +
> +         @SuppressWarnings("unchecked")
> +         @Override
> +         public IterableWithMarker<SecurityGroup> apply(Object input) {
> +            PaginationOptions paginationOptions = 
> PaginationOptions.class.cast(input);
> +            return 
> IterableWithMarker.class.cast(securityGroupApi.listSecurityGroups(paginationOptions));
> +         }
> +
> +         @Override
> +         public String toString() {
> +            return "listSecurityGroups()";

That is my understanding. Should we be doing something else here?

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