Additionally suitable gases may include {TAIL ~ reactive gases} or gases with reactive components, or {HEAD ~ combinations} thereof 
Additionally suitable gases may include { TAIL ~ reactive gases } or gases with reactive components , or { HEAD ~ combinations } thereof
OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH