I have 2 arrays:

```
first_arr = ['A', 'B', 'C', 'D', 'E', 'F']
second_arr = [1, 2, 3, 4, 5, 6]

```

And I'd like to unite them to an array or a list like this:

```
third_arr = [['A',1], ['B',2], ['C',3], ['D',4], ['E',5], ['F',6]]
or my_list = [['A',1], ['B',2], ['C',3], ['D',4], ['E',5], ['F',6]]

```

What is the easiest way to do it?