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Sep 7th, 2015
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  1. f :: Int -> Int
  2. f 1 = 1
  3. f n = f(n-1) + 2 * q(n-1)
  4.  
  5. q :: Int -> Int
  6. q 1 = 1
  7. q n = -2 * f(n-1) + q(n-1)
  8.  
  9. main = do
  10.     print f(5) + q(5)
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