#include<iostream>
#include<cstring>
#include<algorithm>
#include<vector>
#include<queue>
using namespace std;
int read(){
	int ret=0,f=1;char c=getchar();
	while(c>57||c<48){if(c=='-')f= -1;c=getchar();}
	while(c<=57&&c>=48)ret=(ret<<3)+(ret<<1)+(c-48),c=getchar();
	return ret*f;
}
void write(int x){
	if(x<0) x= -x,putchar('-');
	if(x>9)write(x/10);
	putchar(x%10+48);
}
const int maxn=1e5+5;
const int mod =1e9+7;
int n,m;
int pcnt;
int np(){return ++pcnt;}
vector<int>g1[maxn*10],g2[maxn*10];
struct ed{
	int h,t,w;
}e[maxn<<6];
int last[maxn*10],ecnt;
void link(int x,int y,bool o){
	if(o)swap(x,y);
    cerr<<x<<' '<<y<<endl;
	e[++ecnt]={last[x],y};
	last[x]=ecnt;
}
#define ls x<<1
#define rs x<<1|1
int tr[2][maxn<<2];
void build(int x,int l,int r,bool o){
	if(!tr[o][x])tr[o][x]=np();
	if(l==r){link(tr[o][x],l,o);return ;}
	int mid=l+r>>1;
	build(ls,l,mid,o);
	build(rs,mid+1,r,o);
	link(tr[o][x],tr[o][ls],o);
	link(tr[o][x],tr[o][rs],o);
    // cerr<<tr[o][x]<<' '<<tr[o][ls]<<' '<<tr[o][rs]<<endl;
}
void upd_link(int x,int l,int r,int nl,int nr,int k,int o){
	if(nl<=l&&r<=nr){link(k,tr[o][x],o);return;}
	int mid=l+r>>1;
	if(nl<=mid)upd_link(ls,l,mid,nl,nr,k,o);
	if(mid<nr)upd_link(rs,mid+1,r,nl,nr,k,o);
}
int dfn[maxn*10],low[maxn*10],dcnt,col[maxn*10],ccnt,siz[maxn*10],s[maxn*10],top;
bool vis[maxn*10];
void tarjan(int u){
	dfn[u]=low[u]=++dcnt;
	s[++top]=u,vis[u]=1;
	for(int i=last[u];i;i=e[i].h){
		int v=e[i].t;
		if(!dfn[v])tarjan(v),low[u]=min(low[u],low[v]);
		else if(vis[v])low[u]=min(low[u],low[v]);
	}
	if(dfn[u]==low[u]){
        ccnt++;
		while(top){
			col[s[top]]=ccnt;
			siz[ccnt]+=(s[top]<=n);
			vis[s[top]]=0;
			if(s[top--]==u)break;
		}
	}
}
int in[maxn*10];
bool ans[maxn*10];
void clear(){
	for(int i=1;i<=n*4;i++)tr[0][i]=tr[1][i]=0;
	for(int i=1;i<=pcnt;i++)last[i]=0;
    for(int i=1;i<=ccnt;i++)ans[i]=siz[i]=0;
    for(int i=1;i<=ccnt;i++)g1[i].clear(),g2[i].clear();
    for(int i=1;i<=pcnt;i++)dfn[i]=low[i]=col[i]=0;
	ecnt=0,ccnt=0,dcnt=0,pcnt=0;
}
void print(bool x){
    if(x)puts("TAK");
    else {puts("NIE");return;}
    for(int i=1;i<=n;i++)putchar("RF"[ans[col[i]]]);
    putchar('\n');
}
void solve(){
	clear();
    n=read()*3,m=read();pcnt=n;
	build(1,1,n,0);build(1,1,n,1);
	for(int i=1;i<=m;i++){
		int xa=read(),xb=read(),xc=read(),xd=read(),tmp;
		upd_link(1,1,n,xc,xd,tmp=np(),0);
		upd_link(1,1,n,xa,xb,tmp,1);
	}
	tarjan(tr[0][1]);
    for(int u=1;u<=pcnt;u++){
        // cout<<col[u]<<' ';
        for(int i=last[u];i;i=e[i].h){
            int v=e[i].t;
            if(col[u]!=col[v])g1[col[u]].push_back(col[v]),g2[col[v]].push_back(col[u]);
        }
    }
    queue<int>q;
    for(int i=1;i<=ccnt;i++)in[i]=g1[i].size();
    for(int i=1;i<=ccnt;i++)if(!in[i])q.push(i);
    int sum=0;
    while(!q.empty()){
        int u=q.front();q.pop();
        // cerr<<u<<endl;
        if(siz[u]>n/3)continue;
        sum+=siz[u];ans[u]=1;
        if(sum>=n/3){print(1);return;}
        for(int v:g2[u])if(!--in[v])q.push(v);
    }
    for(int i=1;i<=ccnt;i++)if(siz[i]>n/3){
        for(int j=1;j<=ccnt;j++)ans[j]=0,in[j]=g2[j].size();
        ans[i]=1;sum=0;
        for(int j=1;j<=ccnt;j++)if(!in[j])q.push(j);
        while(!q.empty()){
            int u=q.front();q.pop();
            for(int v:g1[u]){ans[v]|=ans[u];if(!--in[v])q.push(v);}
        }
        for(int j=1;j<=ccnt;j++)sum+=ans[j]*siz[j];
        if(sum<=n/3*2){print(1);return;}
    }
    print(0);
}
signed main(){
    int T=read();
    while(T--)solve();
    return 0;
}