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