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BIG-Bench Hard / Here comes a perfectly valid argument: Whoever is not a cousin of Andres is a…

Problem

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input

"Here comes a perfectly valid argument: Whoever is not a cousin of Andres is a workmate of Isaac. Nobody is neither a grandson of Reyes nor a workmate of Isaac. No stepbrother of Phillip is both a grandson of Reyes and a cousin of Andres. Therefore, being a workmate of Isaac is necessary for being a stepbrother of Phillip."
Is the argument, given the explicitly stated premises, deductively valid or invalid?
Options:
- valid 
- invalid

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