96 officials work round 1 -- 3 X 32 games.
48 of those 96 work round 2.
24 of those 48 work round 3.
12 of those 24 work round 4.
For the final 4, there are 3 crews of 3 -- 2 crew each work a semi final, and a different crew works the championship.
At least that is how I have seen it explained in the past.
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