Passage: The Robinson Helicopter Company, based at Zamperini Field in Torrance, California, is a manufacturer of civil helicopters. Robinson produces three models  – the two-seat R22, the four-seat R44, both of which use Lycoming piston engines, and the five-seat R66, which uses a turbine engine.

Question: what are the three models that robinson makes?
the two-seat R22, the four-seat R44, both of which use Lycoming piston engines, and the five-seat R66