M_2(1,2; 3,5) = -1.

 M_2(a,b; -S(b),S(a)) = N(a) + N(b).

 M_3(1,2,3; 4,5,6; 10,20,30).

 M_3(1,2,3; 5,7,11; 13,17,19) = 24.

 M_4(1,2,3,5; 7,11,13,17; 19,23,29,31; 37,41,43,47) = -600.
 #      5

 M_4(1,2*i,3,5; 7*i,11,13,17; 19,23,29,31; 37,41,43,47*i) = -41342 - 50256*i.

 S(M_4(a,b,c,d; e,f,g,h; k,l,m,n; o,p,q,r)) =
  S(a*f*m*r - a*f*n*q - a*g*l*r + a*g*n*p + a*h*l*q - a*h*m*p
  - b*e*m*r + b*e*n*q + b*g*k*r - b*g*n*o - b*h*k*q + b*h*m*o
  + c*e*l*r - c*e*n*p - c*f*k*r + c*f*n*o + c*h*k*p - c*h*l*o
  - d*e*l*q + d*e*m*p + d*f*k*q - d*f*m*o - d*g*k*p + d*g*l*o).

 M_4(a,b,i*c,-i*d; e,2*i*f,i*g,h; a,b,i*c,-i*d; -i*k,7*i*l,m,n).

 M_5(2,4,7,4,21; 12,6,11,9,5; 7,2,13,1,1; 8,6,15,23,9; 1,19,31,3,7) = 693280.

 M_6(2,4,7,4,21,3; 12,6,11,9,5,7; 7,2,13,1,0,5;
    8,6,15,23,9,4; 1,19,31,3,7,4; 1,2,3,5,7,11) = 7033095.
 #      10

 M_7(1,1,2,2,3,3,4; 7,4,2,-1,1,3,5; 2,-1,3,4,0,-6,1; 4,6,3,-3,2,-2,1;
    3,1,-1,0,4,-2,2; 7,1,8,-1,3,3,0; 6,6,5,5,4,4,3)= -392280.

 M_8(1,2,3,4,1,-5,0,7; 9,3,4,1,-2,-6,0,-7; 2,1,3,4,5,2,0,1; 3,7,9,0,2,1,-0,-4;
    2,3,-4,5,1,7,0,8; 1,2,4,7,6,5,0,3; 8,-2,2,6,1,5,0,4; 2,3,1,-1,-3,5,0,-4).

 M_8(1,2,3,4,1,-5,6,7; 1,3,5,7,-6,-5,-4,-2; 2,1,3,4,5,2,1,0; 3,7,9,0,2,1,-1,-4;
    2,3,4,5,1,7,6,8; 1,2,4,7,6,5,4,3; 0,-2,2,6,1,5,3,4; 2,3,1,-1,-3,0,4,-4) =
 -2666736.

 M_8(1+i,2-4*i,3-i,4+5*i,1-6*i,-5+i,2-i,1+i;  9-i,3+i,4+7*i,1-i,-2+i,-6+8*i,5-i,9-i;
    2-i,1-4*i,3+3*i,4+7*i,5-2*i,2-3*i,8-i,2-i;  -4-i,7-2*i,8-i,6-7*i,2+4*i,1+6*i,-2+i,-4-i;
    5+i,3+i,-4-7*i,5-i,11+i,7+2*i,1-7*i,5+i;  1+i,2-i,4+3*i,7+i,6-i,5-4*i,8-3*i,1+i;
    1+8*i,-2-3*i,2+3*i,6-i,1-i,5+i,4-i,1+8*i;  2-9*i,3+i,1-i,-1-6*i,-3-6*i,5+9*i,7+i,2-9*i).

 M_8(a,a,c,d,e,-f,g,h; k,k,m,n,-o,-p,q,-r; s,s,u,v,w,x,y,z; c,c,e,g,k,m,n,-q;
    u,u,-w,y,b,d,f,h; l,l,p,-r,t,v,x,z; -d,-d,g,l,o,r,w,z; b,b,h,-m,-p,s,v,-y).
 #      15

 M_9(1,2,3,4,1,-5,6,7,1; -1,3,5,7,6,5,4,2,-1; 2,1,-3,4,5,2,-1,6,2;
    3,7,9,2,5,1,-1,4,3; 9,-3,4,5,1,7,6,-8,9; 4,2,-4,7,6,5,4,-3,4;
    8,-2,2,6,1,5,3,4,8; 7,3,1,-1,5,3,10,4,7; 5,7,4,-2,1,9,2,-1,5).

 M_9(a,b,c,d,e,-f,g,h,a; n,-o,p,q,r,s,t,u,n; z,a,c,e,g,k,-m,n,z;
     v,-x,b,d,f,h,l,n,v; c,f,-k,n,q,s,v,z,c; l,n,p,-r,t,v,x,z,l;
     q,t,d,-f,g,l,o,r,q; u,b,f,h,-m,p,s,v,u; t,d,r,u,v,f,-s,e,t).

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