semi chemically pulping comminuted cellulosic fibrous material in a cooking vessel using {TAIL ~ a cooking liquor} injected into {HEAD ~ the cooking vessel} 
semi chemically pulping comminuted cellulosic fibrous material in a cooking vessel using { TAIL ~ a cooking liquor } injected into { HEAD ~ the cooking vessel }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD