Andrey Mis\'kov(interesting), Dmytro Petrychenko(interesting), Oleg Sheremet(interesting), Yakov Stepanov(interesting), Yakov Stepanov(important), Nataliya Kolisnichenko(interesting), Yuriy Kodrul(interesting), Natalia Honcharyk(nice), Vsevolod Olenich(nice), Vsevolod Olenich(interesting), Oleksandr Kovalchuk(interesting)