#government_bond__governmentbond  a bond that is an IOU on the US Treasury; considered the safest security in the investment world
  supertype:  bond_certificate__bond  an interest-bearing (or discounted) certificate of debt issued by a government or corporation in order to raise money
  subtype:  savings_bond__savingsbond  non-negotiable government bond; cannot be bought and sold once the original purchase is made
  subtype:  Treasuries__Treasury_obligations  negotiable debt obligations of the US government secured by its full faith and credit
     subtype:  Treasury_bill__T-bill  a short-term obligation that is not interest-bearing (it is purchased at a discount); can be traded on a discount basis for 91 days
     subtype:  Treasury_bond  a debt instrument with maturities of 10 years or longer
     subtype:  Treasury_note  securities with maturities of 1 to 10 years; sold for cash or in exchange for maturing issues or at auction

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