#tumble  an acrobatic feat of rolling or turning end over end
  supertype:  #acrobatic_stunt__acrobatic_feat__acrobaticfeat  a stunt performed by an acrobat
  subtype:  #somersault__somersaulting__flip  an acrobatic feat in which the feet roll over the head (either forward or backward) and return
     subtype:  #flip-flop  a backward somersault

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