Q[a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p,q,r,s,u]
{
p*r+o*s,l*r+k*s,j*r+i*s,f*r+e*s,c*r-b*s,p*q+l*u,o*q+k*u,j*q+f*u,i*q+e*u,d*q-a*u,l*o-k*p,j*o-i*p,f*o-e*p,c*o+b*p,j*l-f*p,i*l-e*p,d*l+a*p,j*k-e*p,i*k-e*o,f*k-e*l,d*k+a*o,c*k+b*l,f*i-e*j,c*i+b*j,d*f+a*j,d*e+a*i,c*e+b*f
}