#include<bits/stdc++.h>
#define fi first
#define se second
#define eb emplace_back
#define mp make_pair
using namespace std;
typedef long double ld;
typedef long long ll;
typedef unsigned long long ull;
typedef __int128 i128;
template<typename T,typename U> T ceil(T x, U y) {return (x>0?(x+y-1)/y:x/y);}
template<typename T,typename U> T floor(T x, U y) {return (x>0?x/y:(x-y+1)/y);}
template<class T,class S> bool chmax(T &a,const S b) {return (a<b?a=b,1:0);}
template<class T,class S> bool chmin(T &a,const S b) {return (a>b?a=b,1:0);}
int popcnt(int x) {return __builtin_popcount(x);}
int popcnt(ll x)  {return __builtin_popcountll(x);}
int topbit(int x) {return (x==0?-1:31-__builtin_clz(x));}
int topbit(ll x)  {return (x==0?-1:63-__builtin_clzll(x));}
int lowbit(int x) {return (x==0?-1:__builtin_ctz(x));}
int lowbit(ll x)  {return (x==0?-1:__builtin_ctzll(x));}

#define rep(i,a,b) for(int i=(a);i<=(b);i++)
#define per(i,a,b) for(int i=(a);i>=(b);i--)
typedef pair<int,int> pii; 
typedef vector<int> vi;
typedef vector<pii> vp;
int read() {
  int x=0,w=1; char c=getchar(); 
  while(!isdigit(c)) {if(c=='-') w=-1; c=getchar();}
  while(isdigit(c)) {x=x*10+(c-'0'); c=getchar();}
  return x*w;
}

const int N=1e5+5;
int x,y,m,lst[N],f[N],vst[N];
vi e[N],A,B;

void work() {
  x=read(), y=read(), m=read();
  A.clear(), B.clear();
  rep(i,1,x) lst[i]=f[i]=0;
  rep(i,1,y) e[i].clear();
  rep(i,1,m) {
    int u=read(), v=read();
    e[v].eb(u), chmax(lst[u],v);
  }
  rep(i,1,y) {
    vi p;
    for(int j:e[i]) if(!vst[j]) p.eb(j), vst[j]=1;
    e[i]=p;
    for(int j:e[i]) vst[j]=0;
  }
  rep(i,1,y) {
    vi s,t;
    for(int j:e[i]) if(lst[j]==i) {
      if(f[j]==0) s.eb(j);
      else t.eb(j);
    }
    if(s.size()<t.size()) {
      for(int j:t) A.eb(j);
    } else {
      B.eb(i);
      for(int j:s) A.eb(j);
      for(int j:e[i]) f[j]^=1;
    }
  }
  printf("%d %d\n",(int)A.size(),(int)B.size());
  for(int x:A) printf("%d ",x); puts("");
  for(int x:B) printf("%d ",x); puts("");
}

signed main() {
  for(int T=read();T;T--) work();
  return 0;
}