#include <memory.h>
#include <iostream>
using namespace std;
 
int main() {
	int N; cin>>N;
	while(N--){
		//input
		int n,m; cin>>n>>m;
		int stu[n+2][m+2]; memset(stu,0,sizeof(stu));
		int L; cin>>L;
		for(int i=0;i<L;i++){
			int x,y; cin>>x>>y;
 
			//share with neighbor
			stu[x-1][y]=1;
			stu[x+1][y]=1;
			stu[x][y]=1;
			stu[x][y-1]=1;
			stu[x][y+1]=1;
		}
 
		//check weather all neighbor get candy or not
		int all_student_get_candy=1;
		for(int row=1;row<n+1;row++){
			for(int col=1;col<m+1;col++){
				if(stu[row][col]==0){
					all_student_get_candy=0;
				}
			}
		}
 
		//output
		if(all_student_get_candy){
			cout<<"Y"<<endl;
		}else{
			cout<<"N"<<endl;
		}
	}
	return 0;
}

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2 3 1
1 1
4 3 4
1 2
2 2
3 2
4 2
5 4 5
1 3
2 1
3 4
4 1
5 3