Removing Unique and Reverse pairs using Awk or Perl -


Below is my sample file (column 1 and column separated by 2 tabs) 

 < code> P-49418 "\ t" O43426 P49418 "\ t" O43426 O43426 "\ t" P 49418 ......   
 Only one for the three pairs shown above Representative should  
  P49418 "\ t" O43426   
 Similar attempts need to be done on the rest files  awk  or How can Pearl be used?  
 
 
 This should work with  awk :  
 < code> awk -F '\ t' '! a [$ 1, $ 2] ++ & amp; Amp; Use both [$ 2, $ 1] ++ 'file   
 in both order form as the key of the array and check the duplicate.  
 $ cate file P49418 O43426 P49418 O43426 O43426 P49418 $ awk -F '\ t' '! One [$ 1, $ 2] ++ & amp; Amp; ! A [$ 2, $ 1] ++ 'file P49418 O43426

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