UVA-839

#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#include<limits.h>
#include<stdbool.h>
bool solve(int *_W)  
{
	bool bl = true, br = true;
	int Wl, Dl, Wr, Dr;
	scanf("%d%d%d%d", &Wl, &Dl, &Wr, &Dr);
	if(!Wl) bl = solve(&Wl);
	if(!Wr) br = solve(&Wr);
	*_W =  Wl + Wr;   
	return bl && br && (Wl * Dl == Wr * Dr);
}
int main()
{
	int caseN, W;
	scanf("%d", &caseN);  
	while(caseN--)
	{
		if(solve(&W)) printf("YES\n");
		else  printf("NO\n");
		if(caseN) printf("\n");		
	} 
	return 0;
}