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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def sync_map_permissions(self):
 """ Access the sync_map_permissions :returns: twilio.rest.sync.v1.service.sync_map.sync_map_permission.SyncMapPermissionList :rtype: twilio.rest.sync.v1.service.sync_map.sync_map_permission.SyncMapPermissionList """

        if self._sync_map_permissions is None:
            self._sync_map_permissions = SyncMapPermissionList(
                self._version,
                service_sid=self._solution['service_sid'],
                map_sid=self._solution['sid'],
            )
        return self._sync_map_permissions