1
/**
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 * @param {string[]} words
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 * @return {boolean}
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 */
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var makeEqual = function (words) {
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  let length = words.length;
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  let map = {};
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  for (let word of words) {
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    for (let ch of word) {
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      map[ch] = (map[ch] || 0) + 1;
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    }
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  }
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  for (let key of Object.keys(map)) {
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    if (map[key] % length != 0) return false;
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  }
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  return true;
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};