

A = zeros(7,7);

A(1,2) = 1; A(1,3) = 1;  A(1,6) = 1;

A(2,4) =1;
A(3,7) = 1;
A(4,5) = 1; A(4,6) = 1;
A(6,2) = 1; A(6,5) = 1
A(7,6) = 1;

	   
