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BIG-Bench Hard / Some football fans admire various clubs, others love only a single team. But…

Problem

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input

"Some football fans admire various clubs, others love only a single team. But who is a fan of whom precisely? The following argument pertains to this question: First of all, some backer of BSC Young Boys is a critic of Trabzonspor AŞ and an expert of Bayer 04 Leverkusen. Next, being an ex-fan of NK Maribor is sufficient for being a critic of Trabzonspor AŞ. Plus,being an expert of Bayer 04 Leverkusen is necessary for being an ex-fan of NK Maribor. So, necessarily, there is somebody who is a backer of BSC Young Boys and an ex-fan of NK Maribor."
Is the argument, given the explicitly stated premises, deductively valid or invalid?
Options:
- valid 
- invalid

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Source and history

task_id
13b2f19b-13a7-53eb-a5cf-01eee6e2b04d
task_key
formal~5ffallacies--main--13b2f19b-13a7-53eb-a5cf-01eee6e2b04d
task_revision_id
1
config / split
formal_fallacies / main

Official source

initial import