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