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