I am working with stack and I've created the following array arr:a,b,c],[d,e,f],[g,h,k;
I know how to extract just first elements using maplist(first, arr); or similar expression for the second. but how to get the following array:
The motivation is to use the first two elements in each line for a MCQ and the last one for the creation of graphs for each choice.
Thanks in advance,