An _un_certain set of rules, you mean. Especially as we're on about language. (-: If the set of rules were certain, we might not be having the these discussions

An _un_certain set of rules, you mean. Especially as we're on about language. (-: If the set of rules were certain, we might not be having the these discussions; yea, and proscriptive grammarians and tyrants of spelling would us all be.