Fran the Fearless has a well-known act at a local zoo. As part of the act, Fran handles a scary animal that she picks at random out of the Box of Terror. The following animals are in the box: 6 poisonous snakes, 7 nonpoisonous snakes, 10 poisonous spiders, and 6 nonpoisonous spiders. What is the probability that the animal Fran picks is poisonous or is a spider? Do not round intermediate computations, and round your answer to the nearest hundredth. 10

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