%this code draws two random integers between 1 and 4, the result si strored
%in r
% if the result in r is (2,1) or (1,2) then the counter is increased by 1
counter=0;
r=floor(rand(1,2)*4+1)
if((r(1)==1&r(2)==2)|(r(1)==2&r(2)==1))
    counter=counter+1;
end
counter