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I'm using SketchUp 8.0.15158.

My sketch has weird regions/lines in it that I can't explain or get rid of. I've redrawn almost the whole thing and the lines persist! See here, highlighted in yellow:

These dotted lines only show up when I triple-click the back face to select the whole object. Here's what the sketch looks like without selections:

What are these lines and how can I get rid of them? They are causing weird issues that I can't seem to get around.

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Note: I was able to delete these mystery lines by selecting everything and then de-selecting everything except those dashed lines, and then hitting delete. But I'd still like to know what caused them and what they are. –  Josh M. Dec 4 '12 at 0:42

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