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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 tle(self, url, reload=False, filename=None):
 """Load and parse a satellite TLE file. Given a URL or a local path, this loads a file of three-line records in the common Celestrak file format, or two-line records like those from space-track.org. For a three-line element set, each first line gives the name of a satellite and the following two lines are the TLE orbital elements. A two-line element set comprises only these last two lines. See the :meth:`~skyfield.iokit.Loader.open()` documentation for the meaning of the ``reload`` and ``filename`` parameters. Returns a dictionary whose keys are satellite names and numbers, and whose values are :class:`~skyfield.sgp4lib.EarthSatellite` objects. If you want to build a list in which each satellite appears only once, simply run ``sats = set(d.values())`` on the returned dictionary. """

        d = {}
        with self.open(url, reload=reload, filename=filename) as f:
            for names, sat in parse_tle(f):
                d[sat.model.satnum] = sat
                for name in names:
                    d[name] = sat
        return d