#include<bits/stdc++.h>
#define rep(i,a,b) for (int i = (a); i <= (b); ++i)
#define drep(i,a,b) for (int i = (a); i >= (b); --i)
#define LL long long
#define il inline
#define pii pair<int,int>
#define pll pair<LL,LL>
#define fi first
#define se second
#define pb push_back
#define mp make_pair
using namespace std;
il LL read() {
	LL x = 0,y = 1; char ch = getchar(); while (!isdigit(ch)) {if (ch == '-') y = -y; ch = getchar();}
	while (isdigit(ch)) {x = x*10+ch-'0'; ch = getchar();} return x*y;
}
namespace qiqi {
	const int N = 5e6+5; int n,m,cnt,dfn[N],low[N],ord,num,stk[N],tp,vis[N],scc[N],siz[N]; char ch[N]; vector<int> e[N],g[2][N];
	struct Seg {
		#define ls (x<<1)
		#define rs (ls|1)
		int c,a[N<<2];
		void build(int x,int l,int r) {
			a[x] = ++cnt; if (l == r) {
				return c ? e[l].pb(a[x]) : e[a[x]].pb(l);
			}
			int mid = l+((r-l)>>1); build(ls,l,mid); build(rs,mid+1,r); 
			if (c) {
				e[a[ls]].pb(a[x]); e[a[rs]].pb(a[x]);
			}
			else {
				e[a[x]].pb(a[ls]); e[a[x]].pb(a[rs]);
			}
		}
		il void init(int n,int _c) {
			c = _c; build(1,1,n);
		}
		void upd(int x,int l,int r,int pl,int pr,int k) {
			if (pl <= l && r <= pr) {
				return c ? e[a[x]].pb(k) : e[k].pb(a[x]);
			}
			int mid = l+((r-l)>>1);
			if (pl <= mid) upd(ls,l,mid,pl,pr,k);
			if (pr > mid) upd(rs,mid+1,r,pl,pr,k);
		}
	} seg[2];
	il void f(int x,int p) {
		scc[x] = p; vis[x] = 0;
		if (x <= n) ++siz[p];
	}
	void tar(int u) {
		dfn[u] = low[u] = ++ord;
		stk[++tp] = u; vis[u] = 1;
		for (auto v:e[u]) {
			if (!dfn[v]) {
				tar(v); low[u] = min(low[u],low[v]);
			}
			else if (vis[v]) {
				low[u] = min(low[u],dfn[v]);
			}
		}
		if (dfn[u] == low[u]) {
			++num; do {
				f(stk[tp],num);
			} while (stk[tp--] != u);
		}
	}
	il bool chk(int x) {
		return x*3 >= n && x*3 <= n*2;
	}
	il void print() {
		puts("TAK");
		rep(i,1,n) printf("%c",ch[scc[i]]);
		puts("");
	}
	il int sum(int u,int p) {
		int res = siz[u];
		for (auto v:g[p][u]) res += sum(v,p);
		return res;
	}
	il void dfs(int u,int p,char c) {
		ch[u] = c; for (auto v:g[p][u]) dfs(v,p,c);
	}
	void main() {
		rep(i,1,cnt) {
			dfn[i] = vis[i] = 0;
			e[i].clear();
		}
		rep(i,1,num) {
			siz[i] = 0;
			rep(j,0,1) g[j][i].clear();
		}
		ord = num = 0;
		cnt = n = 3*read(); m = read();
		rep(i,0,1) seg[i].init(n,i);
		rep(i,1,m) {
			int a = read(),b = read(),c = read(),d = read();
			++cnt; seg[1].upd(1,1,n,a,b,cnt); seg[0].upd(1,1,n,c,d,cnt);
		}
		rep(i,1,cnt) if (!dfn[i]) tar(i);
		rep(u,1,cnt) for (auto v:e[u]) {
			int x = scc[u],y = scc[v];
			if (x != y) {
				g[0][x].pb(y); g[1][y].pb(x);
			}
		}
		rep(i,1,num) ch[i] = 'R';
		rep(i,1,num) if (siz[i]*3 >= n) {
			int x = sum(i,0);
			if (chk(x)) {
				dfs(i,0,'F'); return print();
			}
			x = sum(i,1);
			if (chk(x)) {
				rep(i,1,num) ch[i] = 'F';
				dfs(i,1,'R'); return print();
			}
			puts("NIE"); return;
		}
		int x = 0; rep(i,1,num) {
			x += siz[i]; ch[i] = 'F';
			if (chk(x)) return print();
		}
		puts("NIE");
	}
}
int main() {
	int T = read(); while (T--) qiqi::main(); return 0;
}