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Many journalists are great at explaining the electoral part of politics but miss the policy part, or get the politics and policy but not the race and identity element.

Mathematicians call it the “identity element,” so I’ll denote it by the symbol I. Next come the three genuine ways to flip a mattress. 

We can summarize this property with the equation RR = I, where RR means do R twice, and I is the do-nothing identity element.