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  1. or download this
       .75* (.75/x)   * (.75/x)   * (.75/x)
    
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       .5 * (.5/x)    * (.5/x)    * (.5/x)
     + .5 * (.25*2/x) * (.5/x)    * (.5/x)
    ...
     + .25* (.25*x12) * (.5/x1)   * (.25*x12)
     + .25* (.5/x1)   * (.25*x12) * (.25*x12)
     + .25* (.25*x12) * (.25*x12) * (.25*x12)