#include<bits/stdc++.h>
using namespace std;
const int RN = 100010;
const int N = 500010;
const int M = N*10;
int n, Q;
int head[N], pre[M], ver[M], tot, from[M];
void add(int x,int y){
    ver[++tot]=y; pre[tot]=head[x]; head[x]=tot; from[tot]=x;
//    if (tot>=M-10000) printf("tot=%d\n",tot);
//    printf("x=%d y=%d\n",x,y);
}
int idx;
int spl[N];
int w[N];
int ls[N], rs[N];
void build(int &p,int l,int r,bool z){
    if (l==r) {
        if (!w[l]) w[l]=++idx, spl[idx]=l;
        p=w[l];
        return;
    }
    p=++idx;
//    printf("p=%d l=%d r=%d\n",p,l,r);
    int mid=(l+r)>>1;
    build(ls[p],l,mid,z); build(rs[p],mid+1,r,z);
    if (!(z&1)) add(ls[p],p),add(rs[p],p);
    else add(p,ls[p]),add(p,rs[p]);
}
void update(int p,int l,int r,int pl,int pr,int d,bool z){
    if (l<=pl && pr<=r){
        if (!(z&1)) add(p,d);
        else add(d,p);
        return;
    }
    int mid=(pl+pr)>>1;
    if (mid>=l) update(ls[p],l,r,pl,mid,d,z);
    if (mid+1<=r) update(rs[p],l,r,mid+1,pr,d,z);
}
int dfn[N], low[N], tp, st[N], top, scc[N], sc, siz[N];
bool ins[N];
vector<int> inc[N];
void tarjan(int x){
    dfn[x]=low[x]=++tp;
    st[++top]=x; ins[x]=1;
    for (int i=head[x]; i; i=pre[i]){
        int v=ver[i];
        if (!dfn[v]){
            tarjan(v);
            low[x]=min(low[x],low[v]);
        }
        else if (ins[v]) low[x]=min(low[x],dfn[v]);
    }
    if (dfn[x]==low[x]){
        sc++;
        while(1){
            int qh=st[top--];
            scc[qh]=sc;
            if (spl[qh]) siz[sc]++, inc[sc].push_back(spl[qh]);
            ins[qh]=0;
            if (qh==x) break;
        }
    }
}
vector<int> G0[N], G1[N];
set<pair<int,int> > s;
int dg[N];
bool vis[N];
vector<int> ans;
int bfs(int x){
    for (int i=1;i<=sc;++i) vis[i]=0; ans.clear();
    queue<int> q;
    q.push(x);
    while(q.size()){
        int x=q.front(); q.pop();
        if (vis[x]) continue;
        vis[x]=1;
        for (int i : inc[x]) ans.push_back(i);
        for (int v : G0[x]) q.push(v);
    }
    if (ans.size()<=n/3*2) return 0;
    for (int i=1;i<=sc;++i) vis[i]=0; ans.clear();
//    vis[x]=0;
    q.push(x);
    while(q.size()){
        int x=q.front(); q.pop();
        if (vis[x]) continue;
        vis[x]=1;
        for (int i : inc[x]) ans.push_back(i);
        for (int v : G1[x]) q.push(v);
    }
    if (ans.size()<=n/3*2) return 1;
    return 2;
}
void clear(){for (int i=1;i<=idx;++i) dfn[i]=dg[i]=spl[i]=w[i]=siz[i]=head[i]=0, G0[i].clear(), G1[i].clear(), inc[i].clear(); tp=0; tot=0; idx=0; sc=0; s.clear();}
bool anss[N], flag;
void solve(){
    
    cin>>n>>Q; n*=3;
    int nn=n/3;
    tot=0; idx=0;
    int rt0=0, rt1=0;
    build(rt0,1,n,0);
    build(rt1,1,n,1);
//    printf("tot=%d\n",tot);
    while(Q--){
        int l1,r1,l2,r2; cin>>l1>>r1>>l2>>r2;
//        if (Q==100000-1 && l1==15207) flag=1;
        ++idx;
        update(rt0,l1,r1,1,n,idx,0);
        update(rt1,l2,r2,1,n,idx,1);
//        printf("l=%d r=%d l=%d r=%d\n",l1,r1,l2,r2);
    }
//    printf("idx=%d tot=%d\n",idx,tot);
    for (int i=1;i<=idx;++i){
        if (!dfn[i]) tarjan(i);
    }
//    puts("Yes");
    for (int i=1;i<=tot;++i){
        if (scc[from[i]]!=scc[ver[i]]){
            int x=scc[from[i]], y=scc[ver[i]];

            if (s.find({x,y})!=s.end()) continue;
            s.insert({x,y});
            G0[y].push_back(x); G1[x].push_back(y);
            dg[y]++;
//            printf("un x=%d y=%d dg=%d\n",x,y,dg[y]);
        }
    }
//    for (int i=1;i<=idx;++i) printf("i=%d sc=%d\n",i,scc[i]);
//    for (int i=1;i<=sc;++i) {
//        printf("i=%d dg=%d siz=%d\n",i,dg[i],siz[i]);
//        for (int j : inc[i]) printf("%d ",j); puts("");
//    }
    for (int i=1;i<=sc;++i){
        if (siz[i]>2*nn){
            puts("NIE");
            clear();
            return;
        }
        if (siz[i]>=nn){
            int tmp=bfs(i);
            if (tmp!=2){
                puts("TAK");
//                printf("tmp=%d i=%d\n",tmp,i);
                for (int j=1;j<=n;++j) anss[j]=(tmp^1);
                for (int j : ans) anss[j]=tmp;
                for (int j=1;j<=n;++j) printf(anss[j]?"F":"R"); puts("");
                clear();
                return;
            }
        }
    }
//    puts("Yes");
    for (int i=1;i<=n;++i) anss[i]=1;
    queue<int> q; ans.clear();
    for (int i=1;i<=n;++i){
        if (!dg[i]) q.push(i);
    }
    while(q.size()){
        int x=q.front(); q.pop();
        for (int i : inc[x]) ans.push_back(i);
        if (ans.size()>=nn && ans.size()<=nn*2){
            puts("TAK");
            clear();
            for (int j : ans) anss[j]=0;
            for (int j=1;j<=n;++j) printf(anss[j]?"F":"R"); puts("");
            return;
        }
        for (int v : G1[x]){
            if (--dg[v]==0) q.push(v);
        }
    }
    clear();
    puts("NIE");
}
int main(){
//    freopen("data.in","r",stdin);
    int t; cin>>t;
    while(t--) solve();
    return 0;
}