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code:

#include <iostream>
#include <cstdio>
#include <algorithm>

using namespace std;

typedef long long LL;

const int mod = 1000000007;

inline int QuickPow(int x, int r)
{
    int ret = 1;
    for (; r; r >>= 1)
    {
        if (r & 1) ret = (LL)ret * x % mod;
        x = (LL)x * x % mod;
    }
    return ret;
}

int main()
{
    int T;
    scanf("%d", &T);
    for (int kase = 1; kase <= T; ++kase)
    {
        int n, m, k;
        scanf("%d%d%d", &n, &m, &k);
        int mult = QuickPow(k, (n - 1) * (m - 1)), ans = 0;
        for (int i = 1; i <= k; ++i)
            ans = (ans + (LL)QuickPow(i - 1, n + m - 2) * mult) % mod;
        ans = (LL)ans * (n * m) % mod;
        ans = (ans + QuickPow(k, n * m)) % mod;
        printf("Case #%d: %d\n", kase, ans);
    }
    return 0;
}