Rather, {HEAD ~ the flow hole} 250 maybe implemented as {TAIL ~ any suitable flowpath} connecting the two filters 218,220, including, for example, a rubber or reinforced hose or elongated channel or ductwork 
implemented as
Rather , { HEAD ~ the flow hole } 250 maybe implemented as { TAIL ~ any suitable flowpath } connecting the two filters 218,220 , including , for example , a rubber or reinforced hose or elongated channel or ductwork
OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH