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BIG-Bench Hard / It is not always easy to see who is related to whom -- and in which ways. The…

Problem

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input

"It is not always easy to see who is related to whom -- and in which ways. The following argument pertains to this question: Some classmate of Terri is a workmate of Dolores. Whoever is not a workmate of Dolores is an ancestor of Cheryl. So, necessarily, some ancestor of Cheryl is not a classmate of Terri."
Is the argument, given the explicitly stated premises, deductively valid or invalid?
Options:
- valid 
- invalid

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Source and history

task_id
b30b3d93-eb09-5385-bee2-caba776d2528
task_key
formal~5ffallacies--main--b30b3d93-eb09-5385-bee2-caba776d2528
task_revision_id
1
config / split
formal_fallacies / main

Official source

initial import