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