{HEAD ~ Fluid loss control studies} were conducted under {TAIL ~ 100 psi nitrogen pressures} in enclosed containers 
conducted under
{ HEAD ~ Fluid loss control studies } were conducted under { TAIL ~ 100 psi nitrogen pressures } in enclosed containers
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH