which rocket engine uses an oxidizer of lox and has a chamber pressure of less than 79.0?
(AND spaceflight.bipropellant_rocket_engine (AND (JOIN spaceflight.bipropellant_rocket_engine.oxidizer m.01tm_5) (lt spaceflight.bipropellant_rocket_engine.chamber_pressure 79.0^^http://www.w3.org/2001/XMLSchema#float)))