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- raised questions for anyone who depended on a program in which the year was represented by a two-digit number, such as "97" for 1997. Many programs written years ago (when storage limitations encouraged such information economies) are still being used. The problem was that when the two-digit space allocated for "99" rolled over to 2000, the next number was "00." Frequently, program logic assumes that the year number gets larger, not smaller - so "00" was anticipated to wreak havoc in a program that hadn't been modified to account for the millennium.
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