a thin flat plate having {HEAD ~ an inner edge}, an outer edge and {TAIL ~ two flat surfaces} 
a thin flat plate having { HEAD ~ an inner edge } , an outer edge and { TAIL ~ two flat surfaces }
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL