D

#include<bits/stdc++.h>
using namespace std;

int main(){
    int tst;
    cin>>tst;
    while(tst--){
        int n,k;
        cin>>n>>k;

        vector<int>v;
        int sum =0;

        while(sum < n){
            int newEle=sum+1;

            if(newEle == k)
                newEle ++;

            int mn=newEle;
            int mx=newEle+sum;

            if(k>=mn && k<=mx)
                v.push_back(k-sum-1);
            else
                v.push_back(newEle);

            sum+=v.back();
        }

        int sz=v.size();
        for(int i=0;i<sz && v.size() < 25;i++){
            if(v[i]>k)
                v.push_back(v[i]+k);
        }

        cout<<v.size()<<"\n";
        for(int i=0;i<v.size();i++)
            cout<<v[i]<<" ";
        cout<<"\n";
    }
}