The session start information indicates whether or not {HEAD ~ the new sequential recording unit} is {TAIL ~ a start} of the new session 
is
The session start information indicates whether or not { HEAD ~ the new sequential recording unit } is { TAIL ~ a start } of the new session
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH