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на четвёртом

on the fourth

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phrase Rare #45,525
on the fourth The noun is often omitted when it is clear from context; with месяце, it means “in the fourth month.”
RU: Мы живём на четвёртом этаже.
EN: We live on the fourth floor.

На третьем или на четвёртом.

The third or the fourth.

— Рим, открытый город (1945)