for loop for permutations of for length of array

I have a list of items where the total number of items in the list changes depending on the iteration. theres always at least 2 items, and could be as high as 7. i want a forloop to run that will run until every combination of 2 in the list has completed. ex.

a=[a,b,c]
% i need this to run for 
%ab
%ac
%bc
for i=1:nchoosek(length(a),2)
    %*call a
    a(1)
    %*call b
    a(2)
    %repeat with 
    %a(1) and a(3) 
    %and
    %a(2) and a(3)
end

    

Answer 1

[Matt J]

List=nchoosek([a,b,c],2);

for i=1:size(List,1)

    p1=List(i,1);
    p2=List(i,2);
    
    ...
    
end