How to find mode between two columns?

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Sandy
Sandy 2013-7-9
I have two variables . They are each in a column. I want to find the most common pairs between the two columns.
EX:
12 13
12 15
13 19
34 12
15 90
12 13
90 10
12 13
In this case my most common pair would be 12, 13.
How can I do this?

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dpb
dpb 2013-7-9
MATL
[u,~,c] = unique(a,'rows');
[~,ix]=max(accumarray(c,1));
mdrows=u(ix,:);
Encapsulate in function for general use.

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