{HEAD ~ The respiratory conduit} includes {TAIL ~ at least two air flow control devices}, wherein the at least one airflow control device is configured to withdraw air from at least one location within the respiratory conduit 
{ HEAD ~ The respiratory conduit } includes { TAIL ~ at least two air flow control devices } , wherein the at least one airflow control device is configured to withdraw air from at least one location within the respiratory conduit
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL 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 OTH OTH