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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: To start with, every opponent to FC Dnipro is an opponent to West Ham United FC or an expert of SCR Altach. Now, being a backer of Chelsea FC is necessary for not being an expert of SCR Altach. Moreover, nobody is neither an opponent to West Ham United FC nor a backer of Chelsea FC. All this entails that being a backer of Chelsea FC is necessary for being an opponent to FC Dnipro."
Is the argument, given the explicitly stated premises, deductively valid or invalid?
Options:
- valid 
- invalid

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Source and history

task_id
e4213269-6d8f-5bc4-b109-ddbeb2dfa0fb
task_key
formal~5ffallacies--main--e4213269-6d8f-5bc4-b109-ddbeb2dfa0fb
task_revision_id
1
config / split
formal_fallacies / main

Official source

initial import