{HEAD ~ The apparatus} 13, wherein {TAIL ~ said aperture} is of a width to permit the head of said animal, but not the shoulder through 
wherein
{ HEAD ~ The apparatus } 13 , wherein { TAIL ~ said aperture } is of a width to permit the head of said animal , but not the shoulder through
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH