{HEAD ~ The respiratory conduit} includes {TAIL ~ at least two air flow control devices}, positioned between the patient interface device and the pressurized air generating device 
includes
{ HEAD ~ The respiratory conduit } includes { TAIL ~ at least two air flow control devices } , positioned between the patient interface device and the pressurized air generating device
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