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    Test cases are still wonky. Random test cases had identical successive inputs; first was deemed correct, second was supposedly wrong. See below:

    ======================================================

    Input: 713 31334

    Card Number: { 7 1 3 3 1 3 3 4 }

    Multiplied: { 14 1 6 3 2 3 6 4 }

    Subtracted: { 5 1 6 3 2 3 6 4 }

    Sum: 30

    Valid? True

    ======================================================

    Input: 713 31334

    Card Number: { 7 1 3 3 1 3 3 4 }

    Multiplied: { 14 1 6 3 2 3 6 4 }

    Subtracted: { 5 1 6 3 2 3 6 4 }

    Sum: 30

    Valid? True