#include <bits/stdc++.h>
using namespace std;
int main() {
  ios_base::sync_with_stdio(0);
  cin.tie(0);
  int t;
  cin >> t;
  while (t-- > 0) {
    int l, r;
    cin >> l >> r;
    cout << l << " " << 2 * l << "\n";
  }
  return 0;
}
