De Bruijn sequences: Difference between revisions
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m (→{{header|REXX}}: added a programming note.) |
m (simplified the making the sequence invalid (part of the last task requirement).) |
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:* Reverse the de Bruijn sequence. |
:* Reverse the de Bruijn sequence. |
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:* Again, perform the (above) verification test. |
:* Again, perform the (above) verification test. |
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:* |
:* Replace the 4,444<sup>th</sup> digit with a period (.) in the original de Bruijn sequence. |
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:::* Add '''1''' (unity) to that digit, and take the right-most digit of that sum. |
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:::* Replace the original digit with the above digit (in the de Bruijn sequence). |
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:::* Perform the verification test (again). There should be several PIN codes missing. |
:::* Perform the verification test (again). There should be several PIN codes missing. |
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