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Sinval Santos
10/24/01 08:19am

In a list {{a,b},{b,a} }, como to exclude the term {b,a}?

In[109]:= lis={{1,2},{2,1},{2,6},{3,5},{5,3},{6,2}}
Out[109]= {{1,2},{2,1},{2,6},{3,5},{5,3},{6,2}}

Out[110]= {}

I want to show like this:

URL: ,

Subject (listing for 'To exclude sub list')
Author Date Posted
To exclude sub list Sinval Santos 10/24/01 08:19am
Re: To exclude sub list Henry Lamb 10/27/01 1:44pm
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