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| periodic series | |||
| periodic train | |||
| periodic sequence; periodic string; regular string | |||
| периодическая последовательность: 15 phrases in 8 subjects |
| Computers | 1 |
| Electronics | 3 |
| Makarov | 2 |
| Mass media | 2 |
| Mathematics | 4 |
| Programming | 1 |
| Technology | 1 |
| Weapons of mass destruction | 1 |