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function elem = removedupelem(elem)
%
% elem=removedupelem(elem)
%
% remove doubly duplicated (folded) elements
%
% author: Qianqian Fang, <q.fang at neu.edu>
%
% input:
% elem: list of elements (node indices)
%
% output:
% elem: element list after removing the duplicated elements
%
% -- this function is part of iso2mesh toolbox (http://iso2mesh.sf.net)
%
[el, count1, count2] = unique(sort(elem')', 'rows');
bins = hist(count2, 1:size(elem, 1));
cc = bins(count2);
elem(find(cc > 0 & mod(cc, 2) == 0), :) = [];
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