{HEAD ~ The needle} 136 and the magnetic bar 132 are separated by {TAIL ~ a predetermined interval}  
are separated by
{ HEAD ~ The needle } 136 and the magnetic bar 132 are separated by { TAIL ~ a predetermined interval }
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH