The cavity may include {HEAD ~ a plurality} of pedestals and {TAIL ~ protrusions} configured to create one or more spirals flow paths of a gas traveling through the cavity 
of
The cavity may include { HEAD ~ a plurality } of pedestals and { TAIL ~ protrusions } configured to create one or more spirals flow paths of a gas traveling through the cavity
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH