function count_unique_3(n, k, j = 0) {
	let rows = [];

	subset = [];
	
	function subsets(n, k, j = 0) {
		if (subset.length == k) {
			rows.push(subset.slice(0));
		} else {
			for (let i = j+1; i <= n-k+1+subset.length; ++i) {
				subset.push(i);
				subsets(n,k,i);
				subset.pop();
			}
		}
	}
	
	subsets(n, k);
	
	return rows;
}