Here's an example from last year when it was District 1 vs District 3, and District 2 vs District 4. It's set up so that if everyone won/lost strictly according to seed, the four #1's meet in the semi-finals, a #1 wrestles a #2 in the quarter-finals, and so on.
Plug this into a 16 man bracket, and you'll see what I mean.
D-1 #1
D-3 #4
D-2 #2
D-4 #3
D-2 #3
D-4 #2
D-1 #4
D-3 #1
D-2 #1
D-4 #4
D-3 #3
D-1 #2
D-3 #2
D-1 #3
D-2 #4
D-4 #1
