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150  ▼a중앙 교환국[中央交換局]▲
450  ▼wr▼i영어▼acentral exchange office▲
550  ▼wg▼a교환국[交換局]▲
550  ▼a교환 시스템[交換--]▲
550  ▼a중앙국[中央局]▲