//UVa1149 - Bin Packing
//贪心，背包，乘船问题
include
include
using namespace std;

int a[101000];  //bag

int main(){

//freopen("UVa1149.in","r",stdin);

int t,n,m;

cin>>t;

while(t--){

cin>>n>>m;

for(int i=0;i<n;i++) cin>>a[i];

sort(a,a+n);

int left=0, right=n-1, ans = 0;

while(left <= right){

if(a[right]+a[left] > m) --right;

else --right, ++left;

++ans;

}

cout<<ans<<"\n";

if(t)cout<<"\n";

}

return 0;

}

//已AC