#include <bits/stdc++.h>
using namespace std;
#define GG ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0);
int main () { GG;
int t; cin>>t;
while(t--) {
int n,c=0,x,xx; cin>>n;
int a[n],cnt[100010]={0}; bool f=0;
for(int i=0;i<n;i++)
{ cin>>a[i];
 cnt[a[i]]++;
}
 
for(int i=0;i<100010;i++)
{	if(cnt[i]==0)
	{x=i; break;
	}
}
 
for(int i=0;i<n;i++)
{	
cnt[a[i] ]--;	
if(a[i]<x) c++;
 
	if(c==x)
	{ xx=i;
	  break;
	}
}
 
for(int i=0;i<x;i++)
{	if(cnt[i]==0)
	{	f=1;
		break;
	}
 
}
 
if(f)	cout<<"-1\n";
else	cout<<"2\n"<<"1 "<<xx+1<<"\n"<<xx+2<<" "<<n<<"\n";
 
}return 0;}

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5
2
0 0
5
0 1 2 3 4
8
0 1 7 1 0 1 0 3
3
2 2 2
4
0 1 2 0