1
var findRedundantConnection = function (edges) {
2
  const root = [];
3
  const find = (index) => {
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    const next = root[index];
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    return next ? find(next) : index;
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  };
7

8
  for (const [a, b] of edges) {
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    const x = find(a);
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    const y = find(b);
11

12
    if (x === y) return [a, b];
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    root[x] = y;
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  }
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};