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BIG-Bench Hard / Here comes a perfectly valid argument: To begin with, being a backer of…

Problem

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input

"Here comes a perfectly valid argument: To begin with, being a backer of Olympique de Marseille is sufficient for not being a devotee of SS Lazio. Moreover, every devotee of SS Lazio is a backer of Olympique de Marseille or, otherwise, neither a backer of Olympique de Marseille nor an admirer of AS Saint-Étienne. So, necessarily, being an admirer of AS Saint-Étienne is necessary for being a devotee of SS Lazio."
Is the argument, given the explicitly stated premises, deductively valid or invalid?
Options:
- valid 
- invalid

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Source and history

task_id
daa36d0e-9d07-5b17-be80-6be86efdaf6a
task_key
formal~5ffallacies--main--daa36d0e-9d07-5b17-be80-6be86efdaf6a
task_revision_id
1
config / split
formal_fallacies / main

Official source

initial import