This forces {HEAD ~ the container} downwardly against {TAIL ~ a forming surface} having a configuration corresponding to a desired configuration of the pieces of material 
downwardly against
This forces { HEAD ~ the container } downwardly against { TAIL ~ a forming surface } having a configuration corresponding to a desired configuration of the pieces of material
OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH