time information representing time in {HEAD ~ the first video} within {TAIL ~ the displayable period}, wherein the displayable period is not the entire first video; and 
time information representing time in { HEAD ~ the first video } within { TAIL ~ the displayable period } , wherein the displayable period is not the entire first video ; and
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH