a(1,2)=3.0;
a(2,3)=-3.0;
a(4,3)=2.0;
a(5,5)=1.0;
a(2,1)=3.0;
a(1,1)=2.0;
a(5,2)=4.0;
a(3,4)=2.0;
a(2,5)=6.0;
a(3,2)=-1.0;
a(1,3)=4.0;
a(3,3)=1.0;
