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Thanks for the reply!
I understand that scripting somehow fails to work on such kind of lists. I used hashed arrays in perl to do the same.

Thanks :)

The common pattern is the occurrence of a number say '2' in multiple lines i.e with line starting with '1' and the line stating with '10'. Similarly, occurrence of number '12' in two lines stating...

Hi

I have a file like
1 2
1 2 3
1 5 6
11 12
10 2
7 5
17 12

I would like to have an output as

1 2 3 5 6 10 7
11 12 17

any help would be highly appreciated
Thanks