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BLM has 10 working days to protect or remove discovery at the government 's cost , after which operations may proceed . Driving is the usual mode of transportation for adults age 50 and older , although the percentage of those who are licensed and who drive regularly declines slowly up to age 85 after which there is a substantial reduction in driving . One of the most dramatic charts showed the year-end unreserved credit balance , which was substantial through 1998-99 , after which it virtually disappeared . Treatment involves surgical debridement , after which skin and muscle grafting may be required .