Can anyone improve my program for generate permutations??

Question

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 a = [20 20 20 20 20 20 10 10 10 10];
 a1 = unique(a);
 a2 = perms([a1,fliplr(a1), a1]);
 p1 = [a2 , fliplr(a2),a2 , fliplr(a2), a2];
 p2 = p1 (:, 1:length(a));
 ppp = unique(p2,'rows');
 threshold = 2;
 ppp( sum(ismember(ppp, a1), 2) < threshold, :) = [];
 pp = permute(ppp, [3 2 1]);

I want to generate more permutations. Increase variations of theta. i want to make sequence like this...

 [20 20 10 10 10 10 10 10 10 10] %only two theta's of 20. means change nos of theta
 [ 20 20 20 10 10 10 10 10 10 10]
 [10 10 20 20 20 20 20 20 20 20] and so on...unique theta is not less than 2....