The waste containers are selected from five different types of 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 {HEAD ~ no space} within {TAIL ~ a vertically and horizontally stacked array} of the containers 
within
The waste containers are selected from five different types of 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 { HEAD ~ no space } within { TAIL ~ 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 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 TAIL TAIL TAIL TAIL OTH OTH OTH