While their superstar's been recovering, the Bulls have seen just about every key part of their rotation get banged up at some point, yet they're still standing.

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The key may be how the rebuilt starting rotation holds up until ace Johan Santana returns in midseason.

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Similarly, we can think of long key and certificate validity periods as long password-rotation periods: If passwords are out there forever, someone with malevolent intentions is bound to discover and use them.

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The importance of watching for sector rotation was reinforced in 2011 when many of the key sectors saw double-digit gains and losses from one quarter to another.

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