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