#stock_option__stockoption  the right to buy or sell a stock at a specified price within a stated period
  supertype:  #option  the right to buy or sell property at an agreed price; the right is purchased and if it is not exercised by a stated date the money is forfeited
  subtype:  #call_option  an option to buy
  subtype:  #put_option__putoption  an option to sell

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