Amazon Online Assessment OA1 Debugging - Check Pair Sum Exists

The following function returns true if there exists a pair of numbers in a given 2D array that sums up to a value target. Otherwise, it returns false.

The current implementation of the function compiles successfully but does not return the correct result consistently. Please fix the code so that it passes all test cases.

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  >>> a = [1, 2, 3]
  >>> a[-1]

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