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exercises/luhn/instructions.md

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@@ -10,7 +10,9 @@ Strings of length 1 or less are not valid.
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Spaces are allowed in the input, but they should be stripped before checking.
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All other non-digit characters are disallowed.
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### Example 1: valid credit card number
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## Examples
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### Valid credit card number
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```text
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4539 3195 0343 6467
@@ -38,7 +40,7 @@ Then sum all digits, and if the sum is evenly divisible by 10, the original numb
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80 is evenly divisible by 10, so number `4539 3195 0343 6467` is valid!
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### Example 2: invalid Canadian SIN
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### Invalid Canadian SIN
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```text
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066 123 468

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