#include <bits/stdc++.h>
using namespace std;
int t, n, k;
int main()
{
	cin >> t;
	while (t--)
	{
		cin >> n >> k;
		for (int i = 1; i <= n; i++)
			cout << char((i - 1) % k + 'a');
		cout << endl;
	}
	return 0;
}
 

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