Method code for $root.generations()

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---

  1: arg gen;
  2: var p, out;
  3: 
  4: out = [this()];
  5: if (gen != 0) {
  6:     for p in (.parents())
  7:         out = union(out, p.generations(gen - 1));
  8: }
  9: return out;

---

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