Designer — Eugene Arutyunov site tg book . Developers: versions 1 and 2 — Vladimir Popolitov , version 3 — Michael Kalygin tg , Nataliya Stepanova site tg , Stepan Shashero , version 4 — Misha Rodshtein tg , Maria Veres tg , Ramil Karimov site , Daler Aliyorov site tg .