The puzzle `1287-917ee600` from #1287 has to be resolved: https://github.com/php-coder/mystamps/blob/306595337fbdee34b4424965ed9b59ae7388cdd7/src/main/java/ru/mystamps/web/feature/series/importing/ImportSeriesForm.java#L47-L47 The puzzle was created by Slava Semushin on 21-Mar-20.