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Find the Security Code - Answer

Jerilee's security code is 39876.

Concentrate on those digits which have multiple potential matches per position. There must be 10 matches total per position among the 5 positions. Triple matches will occur for xx1xx and xxx7x.

For the security code, both xx13x and xx17x are disqualified. That leaves xx87x. That leads to x987, then x9876, then 39876.