#include <cstdio>
#include <cmath>
using namespace std;

typedef     long long       LL;

int main()
{
    int t;
    scanf("%d", &t);

    for(int tc = 1; tc <= t; ++tc) {
        LL x, a, y, b;
        scanf("%lld %lld %lld %lld", &x, &a, &y, &b);

        bool ans = (abs(a * log10(x) - b * log10(y)) < 1e-7);

        printf("Case %d: %s\n", tc, (ans? "Yes": "No"));
    }

    return 0;
}