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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 to_dict(self):
 """ Encode the token as a dictionary suitable for JSON serialization. """

        d = {
            'id': self.id,
            'start': self.start,
            'end': self.end,
            'form': self.form
        }
        if self.lnk is not None:
            cfrom, cto = self.lnk.data
            d['from'] = cfrom
            d['to'] = cto
        # d['paths'] = self.paths
        if self.surface is not None:
            d['surface'] = self.surface
        # d['ipos'] = self.ipos
        # d['lrules'] = self.lrules
        if self.pos:
            d['tags'] = [ps[0] for ps in self.pos]
            d['probabilities'] = [ps[1] for ps in self.pos]
        return d