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