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9. If an officer, while officiating in a post or holding a temporary post on a time-scale of pay, is appointed to officiate in a higher post or to
hold a higher temporary post, his officiating or tempoerary service in the higher post shall, if he is re-appointed to the lower post or is appointed or
re-appointed to a post on the same timescale of pay, count for __________ in the time-scale applicable to such lower post.