Okay, let me do this right this time,... (Now that I have my hot tea going;)

Here is the test data: 

SQL> select c1,c2 from cp;

C1  C2
--- ---
AUS DAL
AUS HOU
DAL AUS
DAL HOU
DAL LIT
DAL XYZ
HOU AUS
HOU DAL
HOU LIT
HOU XYZ
LIT DAL

C1  C2
--- ---
LIT HOU
XYZ DAL
XYZ HOU

14 rows selected.

SQL> 

Here is what is required:

C1  C2
--- ---
AUS DAL
DAL AUS
AUS HOU
HOU AUS
DAL HOU
HOU DAL
DAL LIT
LIT DAL
DAL XYZ
XYZ DAL
HOU LIT
LIT HOU
HOU XYZ
XYZ HOU


I think I am clear now... 
Sorry about the wrong test data earlier... 


Thanks,

- Kirti 





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