Second try:
      (power {1, 2, 3}) = ? {{ }, {1}, {2}, {3}, {1,2}, {2,3}, {1,2,3}}


  And I give you a little subject research: if a set x has n elements, how many 
elements are in (power x)?  

  How's this for a wild guess? I have a feeling that it's missing the 
accolades, but I have no idea where to put them.

  (power {x}) =  n(n-1) (n-2)...(n-x+1)



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