{HEAD ~ Connecting ducts} between {TAIL ~ gas cushions} can include venturis that restrict pressure pulses in one gas cushion from traveling to another gas cushion 
between
{ HEAD ~ Connecting ducts } between { TAIL ~ gas cushions } can include venturis that restrict pressure pulses in one gas cushion from traveling to another gas cushion
HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH