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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 reference(node):
 """ A hyperlink. Note that alt text doesn't work, since there's no apparent way to do that in docutils """

    o = nodes.reference()
    o['refuri'] = node.destination
    if node.title:
        o['name'] = node.title
    for n in MarkDown(node):
        o += n
    return o