No "official" set of rules was ever published, because if rules are set in stone, then people will come up with clever ways to bypass them, and then complain when a moderator takes action.
This is so true it's scary. I think it's important to point out that it's even more important to stick to the "spirit" of the rule rather than to the letter of the rule. There will always be a roundabout way to interpret rules that make it such that you're sticking strictly to the letter of the rule, even if you're clearly crossing the boundary. To that end, the rules should also stipulate that someone trying to get around the rules by sticking to them on a literal level while clearly infringing on what the rule was intended to prevent, is also not allowed.
Added in Rule 23 with an example:
23. When deciding if a user has broken the rules, the staff have the right to follow their interpretation of the rules.[e]
23. This rule is meant to prevent from users exploiting possible loopholes in the rules or some interpretations that follow the literal meaning of the rule rather than the meaning of what it truly wanted to prevent.