A document concerning a unicorn contains the following axioms. • If the unicorn is mythical, then it is immortal, but if it is not mythical, then it is a mortal mammal. . If the unicorn is either immortal or a mammal, then it is horned. • The unicorn is magical if it is horned. The document also contains the following conclusion. . The unicorn is magical. Using your intuition and your own words, explain (in English) why the argument appears to be valid.

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