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There are four nouns currently in common use in Russian that have irregular instrumental plurals. They are:
| Nominative plural | Instrumental plural | |
| People | лю́ди | людьми́ |
| Children | де́ти | детьми́ |
| Daughters | до́чери | дочерьми́ |
| Horses | ло́шади | лошадьми́ |
You will also find the instrumental plurals дочеря́ми and лошадя́ми. Gradually those forms will most likely become the dominant forms as the language continues to simplify.