4ae0fd613d4d615a3b811ad4d0acfcf0b6a82439
By default "iterating" a set will use a setseq which may still uniquify information if it finds duplicates (but it may not as it's lazy & al). #flatten conserves the seq type, so if there are two equal operation items amongst all selected operations they may get deduplicated, with the end result of operations disappearing in the final formatted result.
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