| The funny symbols before the posts in the tree view change with the indentation. A reply is indented relative to the post it refers to. And a reply to a reply is indented with repect to the post it refers to and so on. It only gets a bit messy with people not clicking 'Write reply' on the post they are replying to but rather on the one the farthest down the page (which would be your only option on forums with no tree view), probably assuming it to be the newest one (which needn't be the case).
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