{HEAD ~ A very significant amount} of tolerance is allowed for {TAIL ~ the fit} between the blade and the slot, thereby reducing the cost associated with highly accurate 3 D joints 
is allowed for
{ HEAD ~ A very significant amount } of tolerance is allowed for { TAIL ~ the fit } between the blade and the slot , thereby reducing the cost associated with highly accurate 3 D joints
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH