sentences:  Auster D.4
  
  The Auster D.4 was a two-seat British light aircraft, a development of the Auster Arrow with a horizontally opposed Lycoming engine, which originated from a Portuguese Air Force requirement for a liaison/training aircraft.Six were built by Auster Aircraft at their Rearsby, Leicestershire, factory, of which five went to Portugal, and nine more were built under licence in Portugal by the Oficinas Gerais de Matereal Aeronautico OGMA from sets of components built by Auster and shipped from Rearsby.