async def METHOD_NAME(user_id, corpora):
    with plugins.runtime.DB as db:
        curr_list = await db.get(mk_list_key(user_id))
        print(('Current corpora for the user:\n\t{0}'.format(', '.join(curr_list))))
        new_list = []
        for corp in curr_list:
            if corp not in corpora:
                new_list.append(corp)
        await db.set(mk_list_key(user_id), new_list)
        print(('New corpora for the user:\n\t{0}'.format(', '.join(new_list))))