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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 get_dbs():
 """ Get a list of all the Physiobank databases available. Examples -------- """

    url = posixpath.join(config.db_index_url, 'DBS')
    response = requests.get(url)

    dbs = response.content.decode('ascii').splitlines()
    dbs = [re.sub('\t{2,}', '\t', line).split('\t') for line in dbs]

    return dbs