#include <iostream>
using namespace std;
int main() {
// your code goes here
int t;
string z="abcdefghijklmnopqrstuvwxyz";
cin>>t;
while(t--)
{
int n=0;
cin>>n;
string s="";
int i=0;
while(n--)
{
s+=z[i];if(i==25)
{
i=0;
}i++;
}cout<<s<<'\n';
}
return 0;
}
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