Validate International Securities Identification Number: Difference between revisions

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=={{header|langur}}==
The luhn test is repeated here for simplicity (from <a href="https://www.rosettacode.org/wiki/Luhn_test_of_credit_card_numbers#langur">Luhn_test_of_credit_card_numbers#langur</a>).
 
<lang langur>val .luhntest = f(.s) {
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