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Here is a combination lock with 3 secret digits. Using the following clues, find the correct digits and enter your answer below.

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Interesting fact:

Cicadas incubate underground for many years, but strangely, they always seem to choose prime numbers to return to the air. They either remerge after 13 or 17 years underground, with scientists asserting that this behaviour developed to sync up with to a time with less predators around to eat them.

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