A heat pump is an air conditioner that contains a valve that lets it switch between "air conditioner" and "heater".
(A heat pump; is; an air conditioner that contains a valve) (an air conditioner; contains; a valve that lets it switch between "air conditioner" and "heater") (a valve; let; s it switch between "air conditioner" and "heater) Context(a valve let,List([48, 64))):(it; switch; L:between "air conditioner" and "heater)
a valve let,List([48, 64))
A heat pump an air conditioner a valve it
is contains let switch
an air conditioner that contains a valve
a valve that lets it switch between "air conditioner" and "heater"
s it switch between "air conditioner" and "heater
L:between "air conditioner" and "heater