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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 find_preset(self, preset):
 """Find a preset profile matching the specified preset string. :param preset: a string containing a preset profile name. :returns: a matching PresetProfile. """

        # FIXME: allow fuzzy matching?
        for match in self.presets.keys():
            if match == preset:
                return self.presets[match]

        return None