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Language/Type: Python recursion

Write a recursive function named double_digits that accepts an integer as a parameter and returns the integer obtained by replacing every digit with two of that digit. For example, double_digits(348) should return 334488. The call double_digits(0) should return 0. Calling your function on a negative number should return the negation of calling it on the corresponding positive number; for example, double_digits(-789) should return -778899.

Function: Write a Python function as described, not a complete program.

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