Let's be honest: Not all investments turn out to be winners. It's simply a fact that some promising stocks will turn into lemons. And it's why investing in 25 or more companies is so important -- it helps spread your risk by diversifying your portfolio.

Of course, the best case would be to avoid names that could sabotage your portfolio altogether. So, here's a look at two names that I think are better left on the sidelines.

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Source Fool.com