Similarly, additional flow actuators may be used to control the proportions of different types of pulp and filler material in the thick stock and to control the amounts of {HEAD ~ various additives} that are mixed into {TAIL ~ the stock} 
are mixed into
Similarly , additional flow actuators may be used to control the proportions of different types of pulp and filler material in the thick stock and to control the amounts of { HEAD ~ various additives } that are mixed into { TAIL ~ the stock }
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 OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL