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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_load(jid):
    '''
    Merge the load data from all returners
    '''
    ret = {}
    for returner_ in __opts__[CONFIG_KEY]:
        ret.update(_mminion().returners['{0}.get_load'.format(returner_)](jid))

    return ret