func_code_string: #include <bits/stdc++.h>   using namespace std;   int m = 1e9 + 7;   int p = 31;   int main() {     ios_base::sync_with_stdio(false), cin.tie(NULL), cout.tie(NULL);     ;     long long t = 1;     cin >> t;     while (t--) {       long long w, h;       cin >> w >> h;       long long k1, k2, k3, k4;       cin >> k1;       vector<long long> points_h1;       for (int i = 0; i < k1; i++) {         long long x;         cin >> x;         points_h1.push_back(x);       }       cin >> k2;       vector<long long> points_h2;       for (int i = 0; i < k2; i++) {         long long x;         cin >> x;         points_h2.push_back(x);       }       cin >> k3;       vector<long long> points_v1;       for (int i = 0; i < k3; i++) {         long long x;         cin >> x;         points_v1.push_back(x);       }       cin >> k4;       vector<long long> points_v2;       for (int i = 0; i < k4; i++) {         long long x;         cin >> x;         points_v2.push_back(x);       }       long long ans = max({w * (points_v1[points_v1.size() - 1] - points_v1[0]),                            w * (points_v2[points_v2.size() - 1] - points_v2[0]),                            h * (points_h1[points_h1.size() - 1] - points_h1[0]),                            h * (points_h2[points_h2.size() - 1] - points_h2[0])});       cout << ans << endl;     }     return 0;   }   