{TAIL ~ The valve} 11 has {HEAD ~ a housing} 12 with a spring 13 arranged in it 
{ TAIL ~ The valve } 11 has { HEAD ~ a housing } 12 with a spring 13 arranged in it
TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH