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Rev

\$\begingroup\$ This is, of course, much faster, but it doesn't fulfill the question's requirements. key can be any integer, not digit, between lo and hi. \$\endgroup\$

Dennis
– Dennis

2014-02-11 17:31:18 +00:00
Commented Feb 11, 2014 at 17:31
\$\begingroup\$ there is still a mathematical solution, though it would be even longer... \$\endgroup\$

Red Alert
– Red Alert

2014-02-11 22:46:55 +00:00
Commented Feb 11, 2014 at 22:46

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```
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