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["Period 1","1997-01-01","1997-01-31"]
["Period 2","1997-02-01","1997-02-28"]
["Period 3","1997-03-01","1997-03-31"]
["Period 4","1997-04-01","1997-04-30"]
["Period 5","1997-05-01","1997-05-31"]
["Period 6","1997-06-01","1997-06-30"]
["Period 7","1997-07-01","1997-07-31"]
["Period 8","1997-08-01","1997-08-31"]
["Period 9","1997-09-01","1997-09-30"]
["Period 10","1997-10-01","1997-10-31"]
["Period 11","1997-11-01","1997-11-30"]
["Period 12","1997-12-01","1997-12-31"]