The preferred mode of the invention discloses {HEAD ~ a device} wherein {TAIL ~ the action} imposed upon the material being processed becomes progressively less severe as that material goes down stream 
wherein
The preferred mode of the invention discloses { HEAD ~ a device } wherein { TAIL ~ the action } imposed upon the material being processed becomes progressively less severe as that material goes down stream
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH