Help needed for Mission 8

We've been stuck at mission 8 for hours now and finally ran out of ideas on how to beat this mission. Can you guys share some tips/strategies with me that you used to beat it? General tips about strategies that apply to other missions are also appreciated. I know, this is a rather shallow question and I'd love to provide some more detail on our problem, but we really can't figure out what we're doing wrong. Thank you very much!

We're testing a new feature that gives the option to view discussion comments in chronological order. Some testers have pointed out situations in which they feel a linear view could be helpful, so we'd like see how you guys make use of it.

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