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There is a particular four-letter word that you will rarely hear from a sell-side firm: S-E-L-L.

Indeed, it's easy enough to find investment advice about how and when to buy stocks -- but much more of a challenge to find advice about when to sell.

With that in mind, I took a look at the stock charts of Credit Suisse's 12 contrarian stock ideas and found four names that are near their highs and look technically vulnerable.