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Aug 18th, 2017
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  1. edge (a,b)
  2. if (pre[a] < pre[b])
  3. tree or forward
  4. if (pre[a] > pre[b]) && (post[a] < post[b])
  5. back
  6. if (pre[a] > pre[b]) && (post[a] > post[b])
  7. cross
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