In "cited_text" column, fixed missing cases, and converted single item lists to strings

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retrieval corpus and preprocessed briefs

Updated argument completion files

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Rename arg_summ/held-out.json to arg_summ/held_out.json

Rename arg_comp/held-out.json to arg_comp/held_out.json

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Summarization held-out set

Completion task held-out set

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Establish subsets

added argument completion and case retrieval

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