What is the rule to add or remove to make mixed gender fight equalised?

so if there is a rule to add or remove tell me if your club has it is own rules which you see it make it equalised also say the rules have seen some girls talking about that and they said allow hitting below the belt but I don't know is that what make it equal i mean girls could take a low blow and it still hurt

What is the rule to add or remove to make mixed gender fight equalised?
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