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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 getSourcePaths(self, makeGlyphs=True, makeKerning=True, makeInfo=True):
 """ Return a list of paths referenced in the document."""

        paths = []
        for name in self.sources.keys():
            paths.append(self.sources[name][0].path)
        return paths