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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_grain(name, proxy=None):
    '''
    Retrieves the grain value from the cached dictionary.
    '''
    grains = _retrieve_grains_cache(proxy=proxy)
    if grains.get('result', False) and grains.get('out', {}):
        return grains.get('out').get(name)