function matrices(x)

A = [1 2; 3 4];
B = [5 6; 7 8];

N = size(A,1);
M = x;

if(~mod(M,2))
    C = repmat([cat(2,[A B]);cat(2,[B A])],M/2);
else
    C = repmat([cat(2,[A B]);cat(2,[B A])],(M+1)/2);
    C = C(:,1:end-N);
    C = C(1:end-N,:);
end
end

D =  [1     2     5     6
      3     4     7     8
      5     6     1     2
      7     8     3     4]

D =  [1     2     5     6     1     2
      3     4     7     8     3     4
      5     6     1     2     5     6
      7     8     3     4     7     8
      1     2     5     6     1     2
      3     4     7     8     3     4]

D = [1     2     5     6     1     2     5     6
     3     4     7     8     3     4     7     8
     5     6     1     2     5     6     1     2
     7     8     3     4     7     8     3     4
     1     2     5     6     1     2     5     6
     3     4     7     8     3     4     7     8
     5     6     1     2     5     6     1     2
     7     8     3     4     7     8     3     4]