#include <stdio.h>
#include <math.h>
main(){
  double b0[2]={0.,0.}, b1[2]={1.,5.}, b2[2]={2.,3.}, b3[2]={3.,4.};
  double b01[2][11], b12[2][11], b23[2][11];
  double b02[2][11], b13[2][11], b03[2][11], t;
  int k, i;
  for (k=0; k<=10; k++){
    t=(double)k/10.0;
    for (i=0; i<2; i++){
      b01[i][k]=(1.-t)*b0[i]+t*b1[i];
      b12[i][k]=(1.-t)*b1[i]+t*b2[i];
      b23[i][k]=(1.-t)*b2[i]+t*b3[i]; }
  }
  for (k=0; k<=10; k++){
    t=(double)k/10.0;
    for (i=0; i<2; i++){
      b02[i][k]=(1.-t)*b01[i][k]+t*b12[i][k];
      b13[i][k]=(1.-t)*b12[i][k]+t*b23[i][k]; }
  }
  for (k=0; k<=10; k++){
    t=(double)k/10.0;
    for (i=0; i<2; i++){
      b03[i][k]=(1.-t)*b02[i][k]+t*b13[i][k]; }
  }
  for (k=0; k<=10; k++){ 
    printf("%f %f\n", b03[0][k], b03[1][k]); }
}