 I'll follow up on Karen's other two points, but first I want to read that full section of that dissent from Justice Elena Kagan. Congress knows that it does not, and in fact cannot, write perfectly complete regulatory statutes. It knows that those statutes will inevitably contain ambiguities that some other actor will have to resolve, and gaps that some other actor will have to fill. And it would usually prefer that actor to be the responsible agency, not a