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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 has_feature_flags():
    '''
    Check if zpool-features is available
    '''
    # get man location
    man = salt.utils.path.which('man')
    return _check_retcode('{man} zpool-features'.format(
        man=man
    )) if man else False