def decode_conditions(conditions: str):
    """
    Decode the conditions from a JCN mnemonic to a decimal value.

    Parameters
    ----------
    conditions: str, mandatory
        List of a maximum of 4 conditions

    Returns
    -------
    int_conditions: int
        Integer value of the conditions

    Raises
    ------
    N/A

    Notes
    ------
    N/A

    """
    int_conditions = 0

    if 'I' in conditions:
        int_conditions = 8
    if 'A' in conditions:
        int_conditions = int_conditions + 4
    if 'C' in conditions:
        int_conditions = int_conditions + 2
    if 'T' in conditions:
        int_conditions = int_conditions + 1

    return int_conditions