two sets of rules

Woods said last week in the Bahamas he has long been in favor of bifurcation - two sets of rules - similar to aluminum bats and wooden bats in baseball.

From Washington Times ● Dec. 6, 2023

Using these two sets of rules creates the ensemble of domain boundaries for a specific material sample.

From Science Daily ● Dec. 4, 2023

“It’s all connected to people feeling like there’s two sets of rules on the economy,” she said.

From Los Angeles Times ● Mar. 19, 2023

In reality, Google has two sets of rules for weapons ads.

From Salon ● Jun. 15, 2022

I was beginning to see that they had two sets of rules in our district—one for the brainiacs, and one for everybody else.

From "Ungifted" by Gordon Korman