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Notes:
1. Unicode is supported; see help unicode_advice.
2. Maximum number of variables is set to 5000; see help set_maxvar.
. tsset stkcd year
no variables defined
r(111);
. import excel "C:\Users\DELL\Desktop\三废.xlsx", sheet("Sheet1") firstrow
(5 vars, 210 obs)
. tsset code year
variable code not found
r(111);
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