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