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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 getL4PredictedActiveCells(self):
 """ Returns the predicted active cells in each column in L4. """

    predictedActive = []
    for i in xrange(self.numColumns):
      region = self.network.regions["L4Column_" + str(i)]
      predictedActive.append(
        region.getOutputData("predictedActiveCells").nonzero()[0])
    return predictedActive