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BIG-Bench Hard / Here comes a perfectly valid argument: To start with, no stepbrother of Bryan…

Problem

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input

"Here comes a perfectly valid argument: To start with, no stepbrother of Bryan is both a nephew of Wilburn and a son of Howard. Now, whoever is not a son of Howard is a son of Adrian. Moreover, nobody is neither a nephew of Wilburn nor a son of Adrian. Hence, everyone who is a stepbrother of Bryan is a son of Adrian, too."
Is the argument, given the explicitly stated premises, deductively valid or invalid?
Options:
- valid 
- invalid

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Source and history

task_id
010494ba-d48f-56a3-b543-3ffbbcdb768f
task_key
formal~5ffallacies--main--010494ba-d48f-56a3-b543-3ffbbcdb768f
task_revision_id
1
config / split
formal_fallacies / main

Official source

initial import