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if "address" contain any one in the list of "keywords",the "YesorNo" report 1,and "whichword" report the the word in the list of "keywords".

Otherwise,the "YesorNo" report 0,and "whichword" report "NULL".

1. * Example generated by -dataex-. To install: ssc install dataex
   
2. clear
   
3. input str24 address str7 keywords int YesorNo str7 whichword
   
4. "United States of America" "America" 1 "America"
   
5. "shanxi province china"    "china"   1 "china"  
   
6. "shanxi province china"    ""        1 "china"  
   
7. "United States of America" ""        1 "America"
   
8. "anhui province china"     ""        1 "china"  
   
9. "United States of America" ""        1 "America"
   
10. "shanxi province china"    ""        1 "china"  
    
11. "United States of America" ""        1 "America"
    
12. "United Kingdom(UK)"       ""        0 "NULL"   
    
13. "United Kingdom(UK)"       ""        0 "NULL"   
    
14. "east of Canada"           ""        0 "NULL"   
    
15. "Canada west"              ""        0 "NULL"   
    
16. end

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