#include <cstdio>
#include <algorithm>

bool used[100];

int main(){
    int T;
    scanf("%d", &T);

    while(T--){
        int N;
        scanf("%d", &N);

        for(int i=0;i<N;i++){used[i] = false;}
    
        int L[100];
        for(int i=0;i<N;i++){
            scanf("%d", L+i);
        }

        std::sort(L, L+N);

        int res = 0;
        for(int i=0,j=0,k=0;i<N;i++){
            if(used[i]){continue;}
            used[i] = true;
        
            while(j < N && (L[j] <= L[i] || used[j])){j++;}
            if(j == N){break;}
            while(k < N && (L[k] <= L[j] || used[k])){k++;}
            if(k == N){break;}
            
            used[j] = true;
            used[k] = true;
            res++;
        }

        printf("%d\n", res);
    }
}