The lesson in "First Week on GitHub," Reviewing-a-pull-request/pull/3 Step 8 "Don't just review, suggest!" does not work for me. According to doc I've found online, there should be a button with a plus and a minus sign above the comment form. When I try the exercise (and I've tried about four times) there is no such button. Further, this appears to make the lesson bot not complete the lesson, give me credit, and move on.
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