The gamma structures have a base 12′ and {HEAD ~ a plurality} of {TAIL ~ recesses} 16′ defined therewithin 
of
The gamma structures have a base 12′ and { HEAD ~ a plurality } of { TAIL ~ recesses } 16′ defined therewithin
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH