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#include <bits/stdc++.h>
using namespace std;
int a[1005];
int main()
{
int t,n,i,j;
while(~scanf("%d",&t))
{
while(t--)
{
scanf("%d",&n);
for( i = 1; i <= n; i ++)
{
scanf("%d", &a[i]);
}
for( i = 1; i < n; i ++)
{
for( j = i + 1; j <= n; j ++)
{
if(a[j] > a[i])
{
printf("%d-->%d\n",a[i],a[j]);
break;
}
}
if(j == n + 1)printf("%d-->-1\n",a[i]);
}
printf("%d-->-1\n",a[n]);
if(t != 0)printf("\n");
}
}
return 0;
}