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Jun 4th, 2019
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  1. collectLeafs :: X a b -> [a]
  2. collectLeafs (Unit a) = [a]
  3. collectLeafs (Comp b c d) = collect c ++ collect d
  4.  
  5. collectLeafs :: X a b -> [a]
  6. collectLeafs = cataL2D( either singl f)
  7.     where f(Comp b c d) = conc(f c, f d)
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