The waste containers are selected from {HEAD ~ five different types} of {TAIL ~ containers}, each of which types has a geometric configuration such that the containers may be stacked in contiguous fashion with sides abutting so as to leave no space within a vertically and horizontally stacked array of the containers 
of
The waste containers are selected from { HEAD ~ five different types } of { TAIL ~ containers } , each of which types has a geometric configuration such that the containers may be stacked in contiguous fashion with sides abutting so as to leave no space within a vertically and horizontally stacked array of the containers
OTH OTH OTH OTH OTH OTH HEAD 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 OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH