{TAIL ~ a second opening} in surface portions thereof longitudinally spaced from said first opening and {HEAD ~ toward said free extremity}, 
{ TAIL ~ a second opening } in surface portions thereof longitudinally spaced from said first opening and { HEAD ~ toward said free extremity } ,
TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH