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