{HEAD ~ Testing} is accomplished by performing {TAIL ~ ten separate tests} on the transponder that are required to comply with Federal. Aviation Regulations 
is accomplished by performing
{ HEAD ~ Testing } is accomplished by performing { TAIL ~ ten separate tests } on the transponder that are required to comply with Federal . Aviation Regulations
HEAD HEAD HEAD HEAD HEAD REL REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH