def getReactionFromCode(value):
    """
    The input value must be one of: 91, 92, 73, 74, 75
    Returns one of coherent, incoherent, photoelectric, pair, triplet
    according to the integer EADL97 code of the reaction:
                    91 <-> subshell parameters
                    92 <-> transition probabilities
                    93 <-> whole atom parameters
    """
    if value == 91:
        return 'subshell'
    if value == 92:
        return 'transition'
    raise ValueError('Invalid reaction descriptor code')
