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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 _fetch_options(self, merge):
 """Get the fetch options from the given merge dict."""

        cmd = tuple()
        for option in FETCH_DEFAULTS:
            value = merge.get(option, self.defaults.get(option))
            if value:
                cmd += ("--%s" % option, str(value))
        return cmd