#include<cstdio>#include<cstring>#include<cmath>#include<iostream>#include<algorithm>using namespace std;const int maxn=110;int n,h,r,t,T;double ans[maxn];double calc(int t){ if(t<0)return h; double t2=sqrt(2*h/10.0); int k=t/t2; double val; if(k&1)val=k*t2+t2-t; elseval=t-k*t2; return h-10.0*val*val/2;}int main(){ scanf("%d",&T); while(T--) {scanf("%d%d%d%d",&n,&h,&r,&t);for(int i=0;i<n;i++) ans[i]=calc(t-i);sort(ans,ans+n);printf("%.2f",ans[0]);for(int i=1;i<n;i++) printf(" %.2f",ans[i]+2*r*i/100.0);printf("n"); } return 0;}
