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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 allProperties(self):
 """Helper that merges core, extended and custom properties :return: mapping of all properties """

        rval = {}
        rval.update(self.coreProperties)
        rval.update(self.extendedProperties)
        rval.update(self.customProperties)
        return rval