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| 交換 (kōkan); 交換機, 交換ユニット; 交換ユニット; 交換施設; 交換局 (kōkankyoku) | |||
| switching: 5 phrases in 4 subjects |
| Computers | 2 |
| General | 1 |
| Radio | 1 |
| Technology | 1 |
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