#include <iostream>
using namespace std;
int main(){int n,a,b,c,d,e,f,g,h,x,y,z,w;while(cin>>n,n)while(n--){cin>>a>>b>>c>>d>>e>>f>>g>>h;cout<<a*e-b*f-c*g-d*h<<" "<<a*f+b*e+c*h-d*g<<" "<<a*g-b*h+c*e+d*f<<" "<<a*h+b*g-c*f+d*e<<endl;}}