1
var shortestSequence = function (rolls, k) {
2
  let ans = 1;
3
  let sett = new Set();
4

5
  for (let i of rolls) {
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    sett.add(i);
7
    if (sett.size === k) {
8
      ans++;
9
      sett = new Set();
10
    }
11
  }
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  return ans;
13
};