#simulator  a machine that simulates an environment for the purpose of training or research
  supertype:  #machine  any mechanical or electrical device that transmits or modifies energy to perform or assist in the performance of human tasks
  subtype:  #flight_simulator__trainer  simulator consisting of a machine on the ground that simulates the conditions of flying a plane
     subtype:  #Link_trainer  (trademark) an early form of flight simulator

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