{HEAD ~ The pressure regulators} may be {TAIL ~ pressure} regulating screws or valves, or they may comprise dispensing conduits having various cross sectional areas or reservoir conduits having various cross sectional areas 
{ HEAD ~ The pressure regulators } may be { TAIL ~ pressure } regulating screws or valves , or they may comprise dispensing conduits having various cross sectional areas or reservoir conduits having various cross sectional areas
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