another planar portion continuously formed with {TAIL ~ said arcuate portions} and matched to {HEAD ~ the other flat portion} of said elongated mating member, 
another planar portion continuously formed with { TAIL ~ said arcuate portions } and matched to { HEAD ~ the other flat portion } of said elongated mating member ,
OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH