Example 11.3.1     

x1={177,179,95,96,53,32,-7,-4,-3};
x2={179,419,245,131,181,127,-2,1,4};
x3={95,245,302,60,109,142,4,4,11};
x4={96,131,60,158,102,42,4,3,2};
x5={53,181,109,102,137,96,4,5,6};
x6={32,127,142,42,96,128,2,2,8};
x7={-7,-2, 4,4,4,2,34,31,33};
x8={-4,1,4,3,5,2,31,39,39};
x9={-3,4,11,2,6,8,33,39,48};