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#include<bits/stdc++.h>
const int maxn = 1e5 + 10, maxq = 1e5 + 10, maxN = 5e5 + 10;
int n, m, N;
std::vector<int> to[maxN];
inline int newnode() {to[++N].clear(); return N;}
inline void add(int x, int y) {to[x].push_back(y);}
int id[maxn * 4][2];
void build(int k = 1, int l = 1, int r = n) {
   if (l == r) {
      for (int w : {0, 1})
         id[k][w] = l;
      return ;
   }
   int mid = (l + r) >> 1;
   build(k << 1, l, mid), build(k << 1 | 1, mid + 1, r);
   for (int w : {0, 1}) {
      id[k][w] = newnode();
      if (! w) add(id[k << 1][w], id[k][w]), add(id[k << 1 | 1][w], id[k][w]);
      else add(id[k][w], id[k << 1][w]), add(id[k][w], id[k << 1 | 1][w]);
   }
}
void add(int x, int y, int w, int u, int k = 1, int l = 1, int r = n) {
   if (x <= l && r <= y)
      return ! w ? add(id[k][w], u) : add(u, id[k][w]), void();
   int mid = (l + r) >> 1;
   if (x <= mid) add(x, y, w, u, k << 1, l, mid);
   if (mid < y) add(x, y, w, u, k << 1 | 1, mid + 1, r);
}
int dfn[maxN], low[maxN], stk[maxN], top, ins[maxN], dN;
int bl[maxN], siz[maxN], bN;
std::vector<int> son[maxN], G[maxN];
void dfs(int u) {
   dfn[u] = low[u] = ++dN, stk[++top] = u, ins[u] = 1;
   for (int v : to[u]) {
      if (! dfn[v])
         dfs(v), low[u] = std::min(low[u], low[v]);
      else if (ins[v])
         low[u] = std::min(low[u], dfn[v]);
   }
   if (low[u] < dfn[u])
      return ;
   bN++, son[bN].clear(), G[bN].clear();
   do {
      bl[stk[top]] = bN, son[bN].push_back(stk[top]), ins[stk[top]] = 0;
   } while (stk[top--] != u);
}
int deg[maxN], ord[maxN], ti[maxN];
char S[maxn];
int col[maxN], colid[maxN];
void colpre(int u) {
   if (col[u]) return ;
   if (~ colid[u]) col[u] |= 1 << colid[u];
   for (int v : G[u])
      colpre(v), col[u] |= col[v];
}
void dfsc(int u) {
   if (col[u]++) return ;
   for (int v : G[u])
      dfsc(v);
}
inline void Main() {
   scanf("%d%d", &n, &m), n *= 3;
   int lim = n / 3;
   N = 0;
   for (int i = 1; i <= n; i++) newnode();
   build();
   for (int a, b, c, d; m--; ) {
      scanf("%d%d%d%d", &a, &b, &c, &d);
      int x = newnode(), y = newnode();
      add(a, b, 0, x), add(c, d, 1, y);
      add(x, y);
   }
   memset(dfn, 0, sizeof(int) * (N + 1));
   dN = bN = 0;
   for (int i = 1; i <= N; i++)
      if (! dfn[i])
         dfs(i);
   memset(siz, 0, sizeof(int) * (bN + 1));
   for (int i = 1; i <= n; i++)
      siz[bl[i]]++;
   memset(deg, 0, sizeof(int) * (bN + 1));
   for (int i = 1; i <= N; i++)
      for (int j : to[i])
         if (bl[i] != bl[j])
            G[bl[i]].push_back(bl[j]), deg[bl[j]]++;
   std::priority_queue<std::pair<int, int> > Q;
   for (int i = 1; i <= bN; i++)
      if (! deg[i])
         Q.emplace(siz[i], i);
   for (int i = 1; i <= bN; i++) {
      int u = Q.top().second; Q.pop();
      ord[i] = u, ti[u] = i;
      for (int v : G[u])
         if (! -- deg[v])
            Q.emplace(siz[v], v);
   }
   memset(col, 0, sizeof(int) * (bN + 1));
   memset(colid, -1, sizeof(int) * (bN + 1));
   int colN = 0;
   for (int i = 1; i <= bN; i++)
      if (siz[i] >= lim)
         colid[i] = colN++;
   for (int i = 1; i <= bN; i++)
      colpre(i);
   for (int i = bN, tot = 0; i; i--) {
      if (col[i])
         continue;
      tot += siz[ord[i]];
      if (lim <= tot && tot <= lim * 2) {
         puts("TAK");
         for (int u = 1; u <= n; u++)
            printf("%c", "RF"[ti[bl[u]] >= i && ! col[bl[u]]]);
         puts("");
         return ;
      } else if (tot > lim * 2)
         break;
   }
   for (int i = 1; i <= bN; i++) if (siz[i] >= lim) {
      memset(col, 0, sizeof(int) * (bN + 1));
      dfsc(i);
      int cnt = 0;
      for (int j = 1; j <= bN; j++)
         cnt += (col[j] > 0) * siz[j];
      if (lim <= cnt && cnt <= lim * 2) {
         puts("TAK");
         for (int u = 1; u <= n; u++)
            printf("%c", "RF"[col[bl[u]] > 0]);
         puts("");
         return ;
      }
   }
   puts("NIE");
}
int main() {
   int z; scanf("%d", &z);
   while (z--) Main();
   return 0;
}