"But the formula! He destroyed it!" Roger Kay put his other arm about her, smiled down. "That was why I was sent here, Ann. To eliminate possible hitches." "But how--" "Your father destroyed the formula the first time, and I guessed he might do it again--in his mind he was back some twenty years ago, remember--so I took the elementary precaution of placing carbon paper between the third and fourth sheets of that pad of paper. And I sent Wargan the formula while you were with your father, twelve minutes ago." End of the Project Gutenberg EBook of Total Recall, by Larry Sternig