The tool T may be hanged on {HEAD ~ the frame} 1 ready for {TAIL ~ use} 
ready for
The tool T may be hanged on { HEAD ~ the frame } 1 ready for { TAIL ~ use }
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL TAIL TAIL TAIL TAIL TAIL