1 #include<bits/stdc++.h> 2 using namespace std; 3 typedef long long ll; 4 struct tpoint{ 5     double x,y,z; 6     tpoint operator-(const tpoint &p)const{ 7         tpoint q; 8         q.x=x-p.x; 9         q.y=y-p.y;10         q.z=z-p.z;11         return q;12     }13 }p[4];14 int delta(){15     tpoint a,b,c;16     a=p[0]-p[1];17     b=p[0]-p[2];18     c=p[0]-p[3];19     return a.x*b.y*c.z+a.y*b.z*c.x+a.z*b.x*c.y-a.z*b.y*c.x-a.y*b.x*c.z-a.x*b.z*c.y;20 }21 int main(){22     int t;23     cin>>t;24     while(t--){25         for(int i=0;i<4;i++) cin>>p[i].x>>p[i].y>>p[i].z;26             if(delta()==0) cout<<"Yes\n";27             else cout<<"No\n";28     }29     return 0;30 }