A 20-tone Fokker periodicity block for Dan Stearns

Although the 20-tone 13-limit periodicity blocks turned out to be double
10-tone ones, this 11-limit one is not:

Pitches:

cents numerator denominator
0 1 1
62.961 28 27
119.44 15 14
182.4 10 9
252.5 140 121
284.45 33 28
347.41 11 9
417.51 14 11
480.65 33 25
536.95 15 11
599.91 140 99
663.05 22 15
719.35 50 33
782.49 11 7
852.59 18 11
884.36 5 3
947.5 121 70
1017.6 9 5
1080.6 28 15
1137 27 14

Unison vectors:

cents numerator denominator
0.17665 9801 9800
7.1391 243 242
13.795 126 125
17.399 100 99