{HEAD ~ Quorum determination} according to the invention involves {TAIL ~ a determination} of the relative priorities of each subgroup and the award of a quorum to the subgroup having the highest relative priority 
involves
{ HEAD ~ Quorum determination } according to the invention involves { TAIL ~ a determination } of the relative priorities of each subgroup and the award of a quorum to the subgroup having the highest relative priority
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH 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 OTH OTH OTH