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    The "Incorrect id number format" part of the description is not exhaustive.
    The description doesn't explain what to do about x.
    It is not clear what a1 equals to when the last character is x.
    The description probably lacks a formula to calculate x.
    It is impossible to calculate summation of [ a18 * W18, a17 * W17, . . . , a1 * W1 ] without knowing a1.