The legs each has {HEAD ~ a stop} engaged with {TAIL ~ the extensions} for retaining the plate to the base 
engaged with
The legs each has { HEAD ~ a stop } engaged with { TAIL ~ the extensions } for retaining the plate to the base
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH