If the pizza is sliced unevenly, and An tells Bai that they will flip a coin to determine who obtains more of the pizza, then the resulting allocation is substantively fair.

If An and Bai divide the pizza in half, this allocation is substantively fair.

If the bill for the pizza was split unevenly, with An paying more than Bai, and Bai gets more of the pizza, then this allocation is procedurally fair.

If An paid for the whole pizza and only gives one slice to Bai, then this allocation is procedurally fair.