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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 make_user_readable (directory):
 """Make all files in given directory user readable. Also recurse into subdirectories."""

    for root, dirs, files in os.walk(directory, onerror=util.log_error):
        for filename in files:
            make_file_readable(os.path.join(root, filename))
        for dirname in dirs:
            make_dir_readable(os.path.join(root, dirname))