<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def process_form(self, instance, field, form, empty_marker=None, emptyReturnsMarker=False):
 """Return UIDs of the selected services for the AnalysisProfile reference field """


        # selected services
        service_uids = form.get("uids", [])
        # hidden services
        hidden_services = form.get("Hidden", {})

        # get the service objects
        services = map(api.get_object_by_uid, service_uids)
        # get dependencies
        dependencies = map(lambda s: s.getServiceDependencies(), services)
        dependencies = list(itertools.chain.from_iterable(dependencies))
        # Merge dependencies and services
        services = set(services + dependencies)

        as_settings = []
        for service in services:
            service_uid = api.get_uid(service)
            hidden = hidden_services.get(service_uid, "") == "on"
            as_settings.append({"uid": service_uid, "hidden": hidden})

        # set the analysis services settings
        instance.setAnalysisServicesSettings(as_settings)

        return map(api.get_uid, services), {}