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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 register():
 """ Return dictionary of tranform factories """

    registry = {
        key: bake_html(key)
        for key in ('css', 'css-all', 'tag', 'text')
    }
    registry['xpath'] = bake_parametrized(xpath_selector, select_all=False)
    registry['xpath-all'] = bake_parametrized(xpath_selector, select_all=True)
    return registry