Hi, I have a fortran program which generates 2d matrices A1(12x12) and A2(12x12), then combine it in such a way that A2(1,1) is added to A1(7,7), A2(1,2) is added to A1(7,8) and so on (as shown in the attachment). I got the output as matrix A (18 x18) from fortran. all the matrices are declared...