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The TAOCP page has DEK's checks, but it lacks Don's descriptions of problem ratings from 1..50. A friend (now deceased) who was introduced to Don before the friend died similarly rated his problem exercises using his version of the 1..50 scale. So Don inspired some small number of other authors to rate their problems as well. [[Special:Contributions/143.232.210.38|143.232.210.38]] ([[User talk:143.232.210.38|talk]]) 19:54, 3 May 2013 (UTC) P.S. Holder of 2 checks, 1 decimal, other other hex.
:The problems are rated with difficulty 0 to 50, 0 being "extremely easy", 50 requires "research", so for example Fermat's Last Theorem originally had a rating of 50 and now is at 45. [[Special:Contributions/194.207.86.26|194.207.86.26]] ([[User talk:194.207.86.26|talk]]) 07:39, 11 May 2019 (UTC)
== Volume 1, Fascicle 1 ==
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