In 1929, the Soviet Union replaced the seven day week with the nepreryvka or “continuous working week”. Workers were split into five groups on five-day cycles with staggered rest days so that production never stopped. It became common for people to colour-code their friends in their address books according to which day they had off.
1929年，蘇聯用nepreryvka，即「連續工作周」，取代正常的7天周。工人們被分成五組，以五天爲一個工作週期，各組輪流在錯開的休息日休息，使生產不會停止。結果，人們普遍在通訊錄中對親友們進行顏色編碼——根據他們的休息日。
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