#include <stdio.h>
int main()
{
int t,n,a,i;
scanf("%d",&t);
while(t--)
{
int b[100000]={0},a[100000];
scanf("%d",&n);
for(i=0;i<n;i++)
{
scanf("%d",&a[i]);
b[a[i]]++;
}
for(i=0;i<=100000;i++)
{
if(b[i]%2!=0)
{
printf("%d\n",i);
break;
}
}
}
return 0;
}
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