Schematize the following argument and test it for validity by truth-tree, using the following Key of Interpretation: C = Cortright's a rabid libertarian; S = Cortright subscribes to Reason magazine; D = Cortright donates to the Cato Foundation; R = Cortright admires Senator Rand Paul (R-Kentucky); P = Cortright admires Hon. Ron Paul (R-Texas, ret.). Cortright's no rabid libertarian unless he subscribes to Reason magazine or donates to the Cato Foundation. Of course, it can't be the case that he donates to the Cato Foundation and fails either to admire that rabid libertarian, Senator Rand Paul, or the Senator's father, Ron Paul. Now, it's known that Cortright doesn't subscribe to Reason; so, he's a rabid libertarian if only he admires Rand Paulthat is, if he's a Cato donor. Schematize the following argument and test it for validity by truth-tree, using the following Key of Interpretation: C = Cortright's a rabid libertarian; S = Cortright subscribes to Reason magazine; D = Cortright donates to the Cato Foundation; R = Cortright admires Senator Rand Paul (R-Kentucky); P = Cortright admires Hon. Ron Paul (R-Texas, ret.). Cortright's no rabid libertarian unless he subscribes to Reason magazine or donates to the Cato Foundation. Of course, it can't be the case that he donates to the Cato Foundation and fails either to admire that rabid libertarian, Senator Rand Paul, or the Senator's father, Ron Paul. Now, it's known that Cortright doesn't subscribe to Reason; so, he's a rabid libertarian if only he admires Rand Paulthat is, if he's a Cato donor