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Consider the 3-level clock tree shown. If the 6-sigma variation in clock buffer ...

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Consider the 3-level clock tree shown. If the 6-sigma variation in clock buffer delay is +/- 20 ps, and the post-routed delay of each buffer-to-buffer or buffer-flip-flop wire can vary by +/- 5 ps from the pre-layout delay estimate, what is the expected clock skew? 

Assume you can just add the 6-sigma variation to get the final variation.

Give your answer as a number (in ps). For example, if the answer is 25 ps, just enter 25

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