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yy 1 2 3 4 5 6 yymmdd 1 2 3 4 z zero 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 zip closing – 1 2 ’ 1 2 3 “ 1 2 3 4 5 ” 1 2 3 4 5 6 • 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 ●