determining {TAIL ~ a first negative transition temporal relationship} of {HEAD ~ the first negative transition} to a first reference negative transition time; and 
determining { TAIL ~ a first negative transition temporal relationship } of { HEAD ~ the first negative transition } to a first reference negative transition time ; and
OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH