1
var twoSum = function (numbers, target) {
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  let store = {};
3
  for (let i = 0; i < numbers.length; i++) {
4
    if (store[numbers[i]] !== undefined) {
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      return [store[numbers[i]], i + 1];
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    } else {
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      store[target - numbers[i]] = i + 1;
8
    }
9
  }
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};