# Introduction In this programming challenge, we will be working on implementing an address auto-complete function. Given a complete address information in a tree-like format, we need to complete the `findRegion` utility function to find the specific address information based on the user's input query address. The function should return the complete administrative information in the form of an array if the address exists, and `null` otherwise. The objective is to implement the functionality as described and ensure the code works for generic input data.
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