I think I found a bug.
Rot13:
V unir erfphrq 28/29 pelcgvqf. Ohg jura V purpx gur plecgvq genpxre gurer ner ab terra fdhnerf.
V unir erfphrq gur pelcgvq va gur fnzr ebbz nf gur genpxre fb vg'f abg gung gur png vf gnxvat cevbevgl ba gur znc tencuvp.
Sebz zl abgrf fb lbh pna jbex bhg juvpu pelcgvq vg vf:
4, 21 - qbar
7, 13 - qbar
7, 14 - qbar
7, 16 - qbar
6, 13 - qbar
6, 18 - qbar
8, 16 - qbar
8, 17 - qbar
8, 20 - qbar
10, 11 - qbar
10, 12 - qbar
10, 16 - qbar
10, 17 - qbar
11, 16 - qbar
11, 17 - qbar
11, 18 - qbar
11, 20 - qbar
12, 15 - qbar
12, 16 - qbar
12, 17 - qbar
13, 8 - qbar
13, 14 - qbar
14, 15 - qbar
14, 16 - qbar