<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def request_motion_detection_enable(blink, network, camera_id):
 """ Enable motion detection for a camera. :param blink: Blink instance. :param network: Sync module network id. :param camera_id: Camera ID of camera to enable. """

    url = "{}/network/{}/camera/{}/enable".format(blink.urls.base_url,
                                                  network,
                                                  camera_id)
    return http_post(blink, url)