The two online collaborative platform functions that would be most useful in this scenario are:
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Document sharing for co-writing and co-editing - This function allows all group members to collaboratively write and edit each other's summaries in real-time, ensuring that everyone can contribute to the final text and agree on the content.
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Chat functions for leaving comments and providing feedback - This allows group members to communicate effectively about each other's summaries, leave comments for suggestions or edits, and discuss any necessary changes before reaching a consensus on the final versions.