#include <bits/stdc++.h>
using namespace std;
using ll=long long;
using vb=vector<bool>;
using vvb=vector<vb>;
using vd=vector<double>;
using vvd=vector<vd>;
using vi=vector<int>;
using vvi=vector<vi>;
using vl=vector<ll>;
using vvl=vector<vl>;
using pll=pair<ll,ll>;
using tll=tuple<ll,ll>;
using tlll=tuple<ll,ll,ll>;
using vs=vector<string>;
#define all(a) a.begin(),a.end()
#define rall(a) a.rbegin(),a.rend()
#define rep(i,n) range(i,0,n)
#define rrep(i,n) for(ll i=(n)-1;i>=0;i--)
#define range(i,a,n) for(ll i=(a);i<(n);i++)
#define LINF ((ll)1ll<<60)
#define INF ((int)1<<30)
#define EPS (1e-9)
#define MOD (1000000007ll)
#define fcout(a) cout<<setprecision(a)<<fixed
#define fs first
#define sc second
#define PI (3.1415926535897932384)

int dx[]={1,0,-1,0,1,-1,-1,1},dy[]={0,1,0,-1,1,1,-1,-1};
template<class T>bool chmax(T&a,T b){if(a<b){a=b; return true;}return false;}
template<class T>bool chmin(T&a,T b){if(a>b){a=b; return true;}return false;}
template<class S>S sum(vector<S>&a){return accumulate(all(a),S());}
template<class S>S max(vector<S>&a){return *max_element(all(a));}
template<class S>S min(vector<S>&a){return *min_element(all(a));}
ll max(int a,ll b){return max((ll)a,b);} ll max(ll a,int b){return max(a,(ll)b);}
int sgn(const double&r){return (r>EPS)-(r<-EPS);} // a>0  : sgn(a)>0
int sgn(const double&a,const double&b){return sgn(a-b);} // b<=c : sgn(b,c)<=0

template<class T>void puta(T&&t){cout<<t<<"\n";}
template<class H,class...T>void puta(H&&h,T&&...t){cout<<h<<' ';puta(t...);}
template<class S,class T>void tf(bool b,S t,T f){if(b)puta(t);else puta(f);}
void YN(bool b){tf(b,"YES","NO");}
void Yn(bool b){tf(b,"Yes","No");}
void yn(bool b){tf(b,"yes","no");}
template<class S,class T>ostream&operator<<(ostream&os,pair<S,T>p){os<<"["<<p.first<<", "<<p.second<<"]";return os;};
template<class S>auto&operator<<(ostream&os,vector<S>t){bool a=1;for(auto s:t){os<<(a?"":" ")<<s;a=0;}return os;}
template<class S>auto&operator>>(istream&is,vector<S>&t){for(S&a:t)cin>>a;return is;}

/*他のライブラリを入れる場所*/


int main(){
    cin.tie(0);
    ios::sync_with_stdio(false);
    ll _n; cin>>_n;
    rep(_,_n){
        vl data;
        ll tmp;
        while(cin>>tmp,tmp){data.push_back(tmp);}
        ll n=data.size();
        vvl ans(1);
        vl cap(1);
        vl par(101,0);
        ll depth=0, cur=1;


        rep(i,data.size()){
            ll d=data[i];
            // puta(i,":",d,"->", depth, cur);
            // puta(cap);
            
            if(cap.size()!=1 and cap[cur]<=0){
                i--;
                depth--;
                // puta(cur,"がいっぱい", par[depth], "に戻る");
                cur=par[depth];
                continue;
            }


            if(d>0){
                ans.push_back(vl(0));
                cap.push_back(d);
                cur = ans.size()-1;
                if(depth){
                    ans[cur].push_back(par[depth]);
                    cap[cur]--;
                    ans[par[depth]].push_back(cur);
                    cap[par[depth]]--;
                }
                depth++;
                par[depth]=cur;
            }else{
                ans[cur].push_back(par[depth+d]);
                cap[cur]--;
                ans[par[depth+d]].push_back(cur);
                cap[par[depth+d]]--;
            }
            // rep(j,ans.size())puta(j,":",ans[j], "cap=", cap[j]);
            // cerr<<""<<endl;

        }
        range(j,1,ans.size()){
            sort(all(ans[j]));
            puta(j,ans[j]);
        }
    }
    return 0;
}


Measured memory_bytes: 3192