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#include<iostream>
using namespace std;
void xuat(int *b, int k)
{
for(int i = 1;i<=k;i++)
{
cout<<b[i];
}
cout<<endl;
}
void process(int *a, int n , int i, int k)
{
int j;
for(j = a[i-1]+1; j<=n-k+i; j++)
{
a[i] = j;
if(i == k)
{
xuat(a,k);
}
else process(a,n,i+1,k);
}
}
int main()
{
int t;
cin>>t;
while(t--)
{
int n,k,i;
cin>>n>>k;
int a[100];
for(i = 0;i<=k;i++)
{
a[i] = i;
}
i = 1;
process(a,n,i,k);
}
return 0;
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