When {HEAD ~ the holder} is in {TAIL ~ a cutting position}, a cutter is moved to cut one or more notches in the key blank 
is in
When { HEAD ~ the holder } is in { TAIL ~ a cutting position } , a cutter is moved to cut one or more notches in the key blank
OTH 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