The puzzle `1411-1e303594` from #1411 has to be resolved: https://github.com/php-coder/mystamps/blob/32c612cd30f4040f95d5945a59b0efbb358bc007/src/main/java/ru/mystamps/web/feature/series/SeriesService.java#L33-L33 The puzzle was created by Slava Semushin on 31-Jan-21.