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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 thorium(opts, functions, runners):
    '''
    Load the thorium runtime modules
    '''
    pack = {'__salt__': functions, '__runner__': runners, '__context__': {}}
    ret = LazyLoader(_module_dirs(opts, 'thorium'),
            opts,
            tag='thorium',
            pack=pack)
    ret.pack['__thorium__'] = ret
    return ret