If the first receiving unit does have an unused tuner, {HEAD ~ the first receiving device} records {TAIL ~ the particular content} at the particular time 
records
If the first receiving unit does have an unused tuner , { HEAD ~ the first receiving device } records { TAIL ~ the particular content } at the particular time
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH