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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def _processImpurityMatrix(self):
 """Process the impurity matrix so that it can be used to correct observed reporter intensities. """

        processedMatrix = _normalizeImpurityMatrix(self.impurityMatrix)
        processedMatrix = _padImpurityMatrix(
            processedMatrix, self.matrixPreChannels, self.matrixPostChannels
            )
        processedMatrix = _transposeMatrix(processedMatrix)
        return processedMatrix