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<p>[QUOTE=&quot;-jeffB, post: 8482465, member: 27832&quot;]I&#039;ve forgotten most of the stuff I learned in combinatorics, but it seems to me that somewhere north of 30% of all radar notes must be trinary or binary (or solid, but we won&#039;t count those). Pick three different digits, and you&#039;ve only got seven choices left for a fourth digit that differs from all of them.[/QUOTE]</p><p><br /></p>

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