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| Subject | English | Russian |
| construct. | first ten days | первая декада (of a month) |
| product. | first ten-day interval | первая декада (Yeldar Azanbayev) |
| product. | first ten-day period | первая декада (Yeldar Azanbayev) |
| gen. | in the first ten days | в первой декаде (месяца Yeldar Azanbayev) |