Unsure to how this works and would like to make sure before I make any subs?

Will it be 3rd vs 6th & 4th vs 5th or is it a random draw???

Thanking you.

Edit: Forget I asked. It's not random, it's 6th vs 3rd and so on.

Dates for the semi-finals are:

08/5 6v3
09/5 5v4
11/5 3v6
12/5 4v5

So as things stand the first legs would be Burnley v Sheff U then Cardiff v Reading, but it's so close between these 4 teams that you can't really have much idea who will play who. Maybe it will become a bit clearer after today's games.