#include <stdio.h>
#include <iostream>
#include <math.h>
#include <numeric>
#include <vector>
#include <map>
#include <functional>
#include <stdio.h>
#include <array>
#include <algorithm>
#include <string>
#include <assert.h>
#include <stdio.h>
#include <queue>
#include<iomanip>
#include<bitset>
#include<list>
using namespace std;

const int mod = 1000000007;

struct Mod {
	int num;
	Mod() : num(0) { ; }
	Mod(int n) : num((n % mod + mod) % mod) { ; }
	operator int() { return num; }
};

Mod operator+(Mod a, Mod b) { return Mod((a.num + b.num) % mod); }
Mod operator-(Mod a, Mod b) { return Mod((mod + a.num - b.num) % mod); }
Mod operator*(Mod a, Mod b) { return Mod(((long long)a.num * b.num) % mod); }
Mod operator+=(Mod &a, Mod b) { return a = a + b; }
Mod operator-=(Mod &a, Mod b) { return a = a - b; }
Mod operator*=(Mod &a, Mod b) { return a = a * b; }
Mod operator^(Mod a, int n) {
	if (n == 0) return Mod(1);
	Mod res = (a * a) ^ (n / 2);
	if (n % 2) res = res * a;
	return res;
}
Mod inv(Mod a) { return a ^ (mod - 2); }
Mod operator/(Mod a, Mod b) { 
assert(b!=0);
return a * inv(b);
 }

#define MAX_N 1024000

Mod fact[MAX_N], factinv[MAX_N];
void init() {
	fact[0] = Mod(1); factinv[0] = 1;
	for (int i = 0; i < MAX_N - 1; ++i) {
		fact[i + 1] = fact[i] * Mod(i + 1);
		factinv[i + 1] = factinv[i] / Mod(i + 1);
	}
}
Mod comb(int a, int b) {
	return fact[a] * factinv[b] * factinv[a - b];
}

#define REP(i,n) for(int i=0;i<(int)(n);i++)
#define ALL(x) (x).begin(),(x).end()


int dx[4] = { -1,0,1,0 };
int dy[4] = { 0,-1,0,1 };
struct Node {
	Node(int a, int b, int c) {
		atime = a;
		x = b;
		y = c;
	}
	int atime;
	int x;
	int y;
};
class Compare {
public:
	bool operator()(const Node& l, const Node& r) {
		return l.atime < r.atime;
	}
};


int main() {
	while(1) {
		int w, h;
		cin >> w >> h;
		if (!w)return 0;
		vector<vector<int>> maze(h+2, vector<int>(w+2,0));

		int xs, ys, xg, yg;
		cin >> xs >> ys >> xg >> yg;
		int n;
		cin >> n;
		for (int i = 0; i < n; ++i) {
			int c, d, x, y;
			cin >> c >> d >> x >> y;
			if (!d) {
				for (int ax = 0; ax < 4; ++ax) {
					for (int ay = 0; ay < 2; ++ay) {
						maze[y+ay][x+ax] = c;
					}
				}
			}
			else {
				for (int ax = 0; ax < 2; ++ax) {
					for (int ay = 0; ay < 4; ++ay) {
						maze[y + ay][x + ax] = c;
					}
				}
			}
		}
		/*for (int i = 0; i < maze.size(); ++i) {
			for (int j = 0; j < maze[0].size(); ++j) {
				cout << maze[i][j];
			}
			cout << endl;
		}*/
		int color = maze[ys][xs];
		if (!color||color!=maze[yg][xg]) {
			cout << "NG" << endl;
			continue;
		}
		
		vector<vector<bool>>times(h, vector<bool>(w, false));

		priority_queue<Node,vector<Node>,Compare> qu;
		 qu.emplace(0,xs,ys);
		 bool flag=false;
		while (!qu.empty()) {
			Node an(qu.top());
			qu.pop();
			if (an.x == xg&&an.y == yg) {
				flag = true;
				break;
			}
			else {
				for (int i = 0; i < 4; ++i) {
					if (maze[an.y + dy[i]][an.x + dx[i]] == color) {
						if (times[an.y + dy[i]][an.x + dx[i]]) {

						}
						else {
							qu.push(Node{ an.atime + 1,an.x + dx[i], an.y + dy[i] });
							times[an.y + dy[i]][an.x + dx[i]] = true;
						}
						
					}
				}
			}
		}
		if (flag) {
			cout << "OK" << endl;

		}
		else {
			cout << "NG" << endl;
		}
	}
	return 0;

}