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By: a guest on Jun 2nd, 2012  |  syntax: None  |  size: 0.08 KB  |  hits: 11  |  expires: Never
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  1. a b c d
  2. a b 2(c+d)
  3. a 2(b + 2(c+d))
  4. 2(a + 2(b + 2(c + d))) = 2a + 4b + 8c + 8d