Could anyone help me to fix the issue

code:
unused_rows=1:6
while ~isempty(unused_rows)  
N_UE_rows=2;   
rows=unused_rows(randsample(length(unused_rows),N_UE_rows))
[~,idx]=find(ismember(unused_rows,rows))
unused_rows(idx)=[]
end

If i run the code it works.but the number of rows for each group keep on changing if i run the code again and again.But what should be done inorder to fix the number of rows say for example(13,24,56).If i run the code for the next time i should get the same rows in each group(13,24,56).

[KSSV]

If the output is always same, then why to run the code? :)

[Prabha Kumaresan]

the reason for the output to be same is I need to check for the combinations of (15,24,36),(14,26,35) and (12,34,56).If the output is getting fixed,then the output for the first combinations should not reappear in the next combinations.