How did Hercules get the Spanish oxen back to the king of Argos?

He found it in Eryx's herd, but the king would return it only if the hero could beat him in a wrestling contest. Never one to shy away from competition, Hercules beat Eryx three times in wrestling, killed the king, took back the bull, and returned it to the herd.

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congress also has implied powers, which derive from the necessary and proper clause of the constitution and permit congress "to make all laws which shall be necessary and proper for carrying into execution the foregoing powers, and all other powers vested by this constitution in the government of the united states.