gen group = .
replace group = 001 if region == 1 & rural ==0 & education == 9
replace group = 002 if region == 1 & rural ==0 & education == 8
replace group = 003 if region == 1 & rural ==0 & education == 7
replace group = 004 if region == 1 & rural ==0 & education == 6
replace group = 005 if region == 1 & rural ==0 & education == 5
replace group = 006 if region == 1 & rural ==0 & education == 4
replace group = 007 if region == 1 & rural ==0 & education == 3
replace group = 008 if region == 1 & rural ==0 & education == 2
replace group = 009 if region == 1 & rural ==0 & education == 1

replace group = 010 if region == 1 & rural ==1 & education == 9
replace group = 011 if region == 1 & rural ==1 & education == 8
replace group = 012 if region == 1 & rural ==1 & education == 7
replace group = 013 if region == 1 & rural ==1 & education == 6
replace group = 014 if region == 1 & rural ==1 & education == 5
replace group = 015 if region == 1 & rural ==1 & education == 4
replace group = 016 if region == 1 & rural ==1 & education == 3
replace group = 017 if region == 1 & rural ==1 & education == 2
replace group = 018 if region == 1 & rural ==1 & education == 1


replace group = 019 if region == 2 & rural ==0 & education == 9
replace group = 020 if region == 2 & rural ==0 & education == 8
replace group = 021 if region == 2 & rural ==0 & education == 7
replace group = 022 if region == 2 & rural ==0 & education == 6
replace group = 023 if region == 2 & rural ==0 & education == 5
replace group = 024 if region == 2 & rural ==0 & education == 4
replace group = 025 if region == 2 & rural ==0 & education == 3
replace group = 026 if region == 2 & rural ==0 & education == 2
replace group = 027 if region == 2 & rural ==0 & education == 1

replace group = 028 if region == 2 & rural ==1 & education == 9
replace group = 029 if region == 2 & rural ==1 & education == 8
replace group = 030 if region == 2 & rural ==1 & education == 7
replace group = 031 if region == 2 & rural ==1 & education == 6
replace group = 032 if region == 2 & rural ==1 & education == 5
replace group = 033 if region == 2 & rural ==1 & education == 4
replace group = 034 if region == 2 & rural ==1 & education == 3
replace group = 035 if region == 2 & rural ==1 & education == 2
replace group = 036 if region == 2 & rural ==1 & education == 1


replace group = 037 if region == 3 & rural ==0 & education == 9
replace group = 038 if region == 3 & rural ==0 & education == 8
replace group = 039 if region == 3 & rural ==0 & education == 7
replace group = 040 if region == 3 & rural ==0 & education == 6
replace group = 041 if region == 3 & rural ==0 & education == 5
replace group = 042 if region == 3 & rural ==0 & education == 4
replace group = 043 if region == 3 & rural ==0 & education == 3
replace group = 044 if region == 3 & rural ==0 & education == 2
replace group = 045 if region == 3 & rural ==0 & education == 1

replace group = 046 if region == 3 & rural ==1 & education == 9
replace group = 047 if region == 3 & rural ==1 & education == 8
replace group = 048 if region == 3 & rural ==1 & education == 7
replace group = 049 if region == 3 & rural ==1 & education == 6
replace group = 050 if region == 3 & rural ==1 & education == 5
replace group = 051 if region == 3 & rural ==1 & education == 4
replace group = 052 if region == 3 & rural ==1 & education == 3
replace group = 053 if region == 3 & rural ==1 & education == 2
replace group = 054 if region == 3 & rural ==1 & education == 1



请问这样子怎么写循环语句呢？感谢！