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Nico uses a uniform probability model for an experiment using a deck of 40 cards. There are 10 blue cards, 10 red cards, 10 green cards, and 10 yellow cards in the deck. Cards will be drawn one at a time and then replaced in the deck before another card is drawn. He uses the probability model to determine the probability of drawing a green card or a red card. What is P(green or red)? Enter your answer as a simplified fraction in the box.