#scene_of_action__arena  a playing field where sports events take place
  supertype:  playing_field__playingfield__athletic_field__playing_area__playingarea__field  a piece of land prepared for playing a game; "the home crowd cheered when Princeton took the field"
  subtype:  circus.scene_of_action__circu  an arena consisting of an oval or circular area enclosed by tiers of seats and usually covered by a tent; "they used the elephants to help put up the circus"

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