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class Solution {
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  public List<String> stringMatching(String[] words) {
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    List<String> ans = new ArrayList<>();
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    for (int i = 0; i < words.length; i++) {
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      String s = words[i];
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      for (int j = 0; j < words.length; j++) {
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        if (i == j) {
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          continue;
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        }
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        if (words[j].indexOf(s) >= 0) {
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          ans.add(s);
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          break;
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        }
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      }
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    }
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    return ans;
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  }
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}