Extending inwardly from the first edge 18 are {HEAD ~ a plurality} of {TAIL ~ spaced first slots} 26 extending inwardly from the first edge 18  
of
Extending inwardly from the first edge 18 are { HEAD ~ a plurality } of { TAIL ~ spaced first slots } 26 extending inwardly from the first edge 18
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH