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Its a non sequitur.
1. If A is contingent, then A is neither necessarily true nor necessarily false
2. If A is indeterminate, then A is neither true nor false, hence neither necessarily true nor necessarily false
3. Therefore, any sentence that has an indeterminate truth value is contingent
OR
1. If A is in Paris, he is not in New York
2. If A is in London, he is not in New York.
3. Therefore, any person who is not in New York must be in Paris.
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