#include <iostream>
#include <cstdio>
#include <vector>
#include <set>
using namespace std;
int read(){
	int x=0;
	char ch=getchar();
	while(ch<'0'||ch>'9')ch=getchar();
	while(ch>='0'&&ch<='9')x=x*10+ch-'0',ch=getchar();
	return x;
}
int t,n,B[200005];
int l[200005],r[200005];
vector<pair<int,int>> ins[200005];
set<int> c;
int p[200005];
int a[200005];
int cnt[200005];
int main(){
	t=read();
	while(t--){
		n=read();
		for (int i=1;i<=n;i++)l[i]=0,r[i]=i-1;
		int x=n+1;
		for (int i=1;i<=n;i++){
			B[i]=read();
			if (B[i]<n)l[B[i]+1]=max(l[B[i]+1],i);
			if (B[i]!=n+1)r[B[i]]=min(r[B[i]],i-1);
			if (B[i]==n+1&&x==n+1)x=i; 
		}
		for (int i=1;i<=n;i++)l[i]=max(l[i],l[i-1]);
		c.clear();
		for (int i=1;i<=n;i++)
			if (i!=x-1)c.insert(i);
		int fg=1;
		for (int i=1;i<=n;i++)ins[r[i]].push_back(make_pair(l[i],i));
		for (int i=0;i<=n;i++){
			for (int j=0;j<(int)ins[i].size();j++)
				if (ins[i][j].first>0){
					set<int>::iterator it=c.lower_bound(ins[i][j].first);
					if (it!=c.end()&&(*it)<=i)p[ins[i][j].second]=(*it),c.erase(it); 
					else fg=0;
				}
				else p[ins[i][j].second]=0;
		}
		for (int i=0;i<=n;i++)
			for (int j=0;j<(int)ins[i].size();j++)
				if (ins[i][j].first==0){
					if (c.begin()!=c.end()&&(*c.begin())<=i)p[ins[i][j].second]=(*c.begin()),c.erase(c.begin());
				}
		for (int i=0;i<=n;i++)ins[i].clear();
		if (fg==1){
			int tot=0;
			for (int i=1;i<=n;i++)
				if (p[i]==0)a[i]=++tot;
				else a[i]=a[p[i]];
			int qwq=0;
			int j=n+1;
			for (int i=n;i>=1;i--){
				cnt[a[i]]++;
				if (cnt[a[i]]==1){
					qwq++;
					if (qwq==tot)j=n;
				}
				while(qwq==tot&&j>i&&cnt[a[j]]>1){
					cnt[a[j]]--;
					j--;
				}
				if (j!=B[i])fg=0; 
			}
			for (int i=1;i<=n;i++)cnt[a[i]]=0;
		}
		if (fg==0)printf("-1\n");
		else{
			for (int i=1;i<=n;i++)printf("%d ",a[i]);
			printf("\n");
		}
	} 
	return 0;
}