text: #include "io.h"
  // input: 1 2 3 4
  int a[4];
  int *pa = a;
  int main()
  {
      int *pb[4];
  	int i;
  	pb[0] = pa;
  	pb[1] = pa;
  	pb[2] = pa;
  	pb[3] = pa;
  	outlln(4);
  	for (i = 0; i < 4; i++)
  		pb[0][i] = i + 1;
  	for (i = 0; i < 4; i++)
  		outl(pb[1][i]);
  	println("");
  	for (i = 0; i < 4; i++)
  		pb[2][i] = 0;
  	for (i = 0; i < 4; i++)
  		outl(pb[3][i]);
  }
  