When {HEAD ~ the test contactor} is in {TAIL ~ a test position}, only one of the pair of conductors is in contact with the test contact member 
is in
When { HEAD ~ the test contactor } is in { TAIL ~ a test position } , only one of the pair of conductors is in contact with the test contact member
OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH