Thus, although a particular waste material may have little or no utility in the month or year in which it is located at the waste disposal site and stacked in the pyramid of containers, its contents may become quite valuable at some future time as a charge stock or intermediate material in a manufacturing facility making {HEAD ~ useful products} of {TAIL ~ the future} 
of
Thus , although a particular waste material may have little or no utility in the month or year in which it is located at the waste disposal site and stacked in the pyramid of containers , its contents may become quite valuable at some future time as a charge stock or intermediate material in a manufacturing facility making { HEAD ~ useful products } of { TAIL ~ the future }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL