The number of the first protruding portions 141 a equals to {HEAD ~ the number} of {TAIL ~ the through holes} 144 
of
The number of the first protruding portions 141 a equals to { HEAD ~ the number } of { TAIL ~ the through holes } 144
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH