#gym_mat__mat  sports equipment consisting of a piece of thick padding on the floor for gymnastic sports
  supertype:  #sports_equipment__sporting_goods  equipment needed to participate in a particular sport
  subtype:  #canvass__canvas  the mat that forms the floor of the ring in which boxers or professional wrestlers compete; "the boxer picked himself up off the canvas"
  subtype:  #wrestling_mat__wrestlingmat  a mat on which wrestling matches are conducted

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