function gcd(m, n) {
  while (true) {
    m %= n;
    if (m === 0) {
      return n;
    }
    n %= m;
    if (n === 0 ) {
      return m;
    }
  }
}

function gcdlcm(a ,b) {
  var n = gcd(a,b);
  return [n, a * b / n];
}