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| elementary school; (2) |
| Ukrainian language; (2) |
| младшие школьники; (2) |
| молодші школярі; (2) |
| начальная школа; (2) |
| украинский язык; (2) |
| українська мова; (2) |
| ecological education. (1) |
| elementary school students; (1) |
| junior high school student; (1) |