фон - Александр Вениаминович Хвостенко-Хвостов
https://belghm.ru/o-muzee/nauka-i-publikacii/stati/ot-krepostnykh-khudozhnikov-do-myetrov-so/
since 01:10:839 (5,1) - is stacked with 1/4 rhythm, similarly stacking these notes would confuse players because all 1/2 rhythms have at least some spacing, never really stacked directly on top of each other