{HEAD ~ Each set} of {TAIL ~ resources} is allocated only for the period of time needed to perform the required function 
of
{ HEAD ~ Each set } of { TAIL ~ resources } is allocated only for the period of time needed to perform the required function
HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH