text: function multiplyAll(arr) {
    var product = 1;
    // Only change code below this line
    for (var i = 0; i < arr.length; i++) {
      for (var j = 0; j < arr[i].length; j++) {
        product *= arr[i][j];
      }
    }
    // Only change code above this line
    return product;
  }
  
  console.log(multiplyAll([[1,2],[3,4],[5,6,7]]));
  