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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 available_freq():
 """ function for checking available frequency """

    _file = open(CPU_PREFIX + 'cpu0/cpufreq/scaling_available_frequencies')

    freq = [int(_file) for _file in _file.read().strip().split()]

    _file.close()

    return freq