#include<cstdio>
#include<cstring>
#include<stack>
struct p{
	int x;
	int y;
};
using namespace std;
int main(){
	int w,h,sx,sy,gx,gy,n,c,d,x,y,i,j,k,o;
	int map[100][100];
	int used[100][100];
	int mx[4]={-1,0,1,0};
	int my[4]={0,-1,0,1};
	p v,u;
	stack<p> s;
	while(1){
		scanf("%d %d",&w,&h);
		if(w==0&&h==0){
			break;
		}
		memset(map,0,sizeof(map));
		memset(used,0,sizeof(used));
		scanf("%d %d",&sx,&sy);
		sx--;
		sy--;
		scanf("%d %d",&gx,&gy);
		gx--;
		gy--;
		scanf("%d",&n);
		for(i=0;i<n;i++){
			scanf("%d %d %d %d",&c,&d,&x,&y);
			x--;
			y--;
			if(!d){
				for(j=y;j<y+2;j++){
					for(k=x;k<x+4;k++){
						map[j][k]=c;
					}
				}
			}
			else{
				for(j=y;j<y+4;j++){
					for(k=x;k<x+2;k++){
						map[j][k]=c;
					}
				}
			}
		}
		if(map[sy][sx]!=map[gy][gx]){
			printf("NG\n");
			continue;
		}
		v.x=sx;
		v.y=sy;
		s.push(v);
		o=0;
		while(!s.empty()){
			v=s.top();
			s.pop();
			if(used[v.y][v.x]){
				continue;
			}
			else{
				used[v.y][v.x]=1;
			}
			if(v.x==gx&&v.y==gy){
				o=1;
				while(!s.empty()){
					s.pop();
				}
				break;
			}
			for(i=0;i<4;i++){
				u=v;
				u.x+=mx[i];
				u.y+=my[i];
				if(u.x>=0&&u.x<w&&u.y>=0&&u.y<h&&map[u.y][u.x]==map[sy][sx]){
					s.push(u);
				}
			}
		}
		if(o){
			printf("OK\n");
		}
		else{
			printf("NG\n");
		}
	}
	return 0;
}
#include <iostream>
#include <string>
using namespace std;

string ans;
int w,h,gx,gy;
int map[110][110];
int dx_[4] = {0,1,0,-1};
int dy_[4] = {1,0,-1,0};
int dx[2][8] = {
	{0,1,2,3,0,1,2,3},
	{0,1,0,1,0,1,0,1}
};
int dy[2][8] = {
	{0,0,0,0,1,1,1,1},
	{0,0,1,1,2,2,3,3},
};
void solve(int x,int y,int color){
	if( ans == "OK" || color == 0 /*|| map[y][x] != color*/ ) return;
	//if( x<0 || x>w || y<0 || y>h ) return;

	for(int i=0 ; i<4 ; ++i ){
		int mx = x + dx_[i];
		int my = y + dy_[i];
		if( mx<0 || mx>w || my<0 || my>h ) continue;
		//cout << "x:" << x << " y:" << y << endl;
		
		if( map[my][mx] == color ){
			if( mx == gx && my == gy ){
				ans = "OK";
			}else{
				map[my][mx] = 0;
				solve( mx , my , color );
			}
		}
	}
}

void debug(){
	char c[6] = {' ','#','$','*','+','@'};
	cout << "w:" << w << " h:" << h << " map : " << endl;
	for(int y=0 ; y<h ; ++y ){
		for(int x=0 ; x<w ; ++x ){
			cout << c[ map[y][x] ];
		}
		cout << endl;
	}
}

int main(){
	int sx,sy,n;
	
	while( cin >> w >> h , w|h ){
		ans = "NG";
		for(int y=0 ; y<110 ; ++y )
			for(int x=0 ; x<110 ; ++x )
				map[y][x] = 0;

		cin >> sx >> sy >> gx >> gy >> n ;
		for(int i=0 ; i<n ; ++i ){
			int c,d,x,y;
			cin >> c >> d >> x >> y;
			for(int j=0 ; j<8 ; j++){
				int mx = x + dx[d][j];
				int my = y + dy[d][j];
				map[my][mx] = c;
			}
		}
		//debug();
		//map[sy][sx] = 0;
		solve( sx , sy , map[sy][sx] );
		//cout << "sx:" << sx << " sy:" << sy << endl;
		cout << ans << endl;
	}
}