12WTN is the equal division of the just perfect fifth into six parts of 116.9925 cents each alternated with a sequence of six equal steps of another interval between 100 and 133.333 cents in its patent tunings.

Optimal Intervals

Target a Target b
1 116.9925
2 233.985
3 350.9775
4 467.97
5 584.9625
6 701.955
7 826.466 801.564
8 950.9775 901.173
9 1075.4885 1000.782
10 1200 1101.391
11 1324.511 1200
12 1449.0226 1299.609