#include <cstring>
#include <string>
#include <iostream>
#include <cstdio>

using namespace std;
typedef long long int64;

int t;
int64 A,B,C;
int main()
{
   scanf("%d",&t);
   while(t--)
   {
      scanf("%lld%lld%lld",&A,&B,&C);
      bool found = false;
      for(int i=7; found == false ; ++i)
      {
              if((B-A)%(i-6)==0)
	      {
              	int64 D = (B-A)/(i-6);
              	int64 T = A+B+D;
              	if(T*i==2*C)
	      	{
                  int64 F = A-2*D;
                  printf("%d\n",i);
                  for(int k=0; k<i; ++k)
		   {
                    	 printf("%lld ",F+k*D);
                   }
                  printf("\n"); found = true;
              }
          }
      }
   }
   return 0;
}