#include<stdio.h>
#define N =10
int search(int *list, int n,int x);
int main()
{
    int repeat;
    int n,x;
    int a[N];
    scanf("%d",&repeat);
    while(repeat>0)
    {
        scanf("%d",&n);
        for(int i=0;i<n;i ++)
            scanf("%d",&a[i]);
        
        scanf("%d",&x);
        int m =search(a, n, x);
        if(m==-1)
            printf("Not found");
             else
           printf("index = %d\n", m);
                   repeat--;
                   }
                   return 0;
}
int search(int *list, int n,int x);
{
int i;
      for(i=0;i<n;i ++)
      {
          if(list[i] == x)
          {
              return i;
              break;
          }
      }
     return -1;
                   }

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