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class Solution {
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 public:
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  vector<int> twoOutOfThree(vector<int> &nums1, vector<int> &nums2, vector<int> &nums3) {
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    vector<int> f(110, 0);
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    for (int n : nums1) f[n] |= 1 << 0;
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    for (int n : nums2) f[n] |= 1 << 1;
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    for (int n : nums3) f[n] |= 1 << 2;
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    vector<int> ret;
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    for (int i = 1; i <= 100; i++)
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      if (f[i] == 3 || f[i] >= 5) ret.push_back(i);
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    return ret;
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  }
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};