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BIG-Bench Hard / Here comes a perfectly valid argument: There exists a workmate of Guadalupe who…

Problem

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input

"Here comes a perfectly valid argument: There exists a workmate of Guadalupe who is an ancestor of Jewel while not a niece of Nelda. Nobody is neither a stepsister of Christine nor a niece of Nelda. So, necessarily, there exists a workmate of Guadalupe who is an ancestor of Jewel and a stepsister of Christine."
Is the argument, given the explicitly stated premises, deductively valid or invalid?
Options:
- valid 
- invalid

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Source and history

task_id
80d1a281-6927-5599-bfd0-c6ae2b210259
task_key
formal~5ffallacies--main--80d1a281-6927-5599-bfd0-c6ae2b210259
task_revision_id
1
config / split
formal_fallacies / main

Official source

initial import