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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 begin with, nobody is neither an expert of FC Shakhtar Donetsk nor an opponent to PFC CSKA Moskva. Moreover, some opponent to PFC CSKA Moskva is not both a friend of Real Sociedad de Fútbol and an expert of FC Pyunik. Hence, there is somebody who is a friend of Real Sociedad de Fútbol, an expert of FC Pyunik, and an expert of FC Shakhtar Donetsk."
Is the argument, given the explicitly stated premises, deductively valid or invalid?
Options:
- valid 
- invalid

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Source and history

task_id
b3b63ebe-e5d4-5e2b-bc36-34f3fb0c1ad4
task_key
formal~5ffallacies--main--b3b63ebe-e5d4-5e2b-bc36-34f3fb0c1ad4
task_revision_id
1
config / split
formal_fallacies / main

Official source

initial import