Armando has a card trick for Andrew: "I have 10 cards, numbered 1-10. I have arranged the cards in a stack in a special way. The first card facing up is a 1, and I am putting it on the table. The second card I am putting at the bottom of the stack. The third card, which is a 2, I'm putting on the table next to 1. Then the 4th card goes to the bottom of the stack. I'll continue putting one card on the table and the next card to the bottom of the stack until I put card 10 on the table. How did I first arrange the cards in the stack?