#include<cstdio>
#define N 105
using namespace std;
int t,n,m,k,a[N];
int read(){
	int sum=0;bool f=0;char c=getchar();
	for(;c<48||c>57;c=getchar())if(c==45)f=1;
	for(;c>=48&&c<=57;c=getchar())sum=sum*10+(c&15);
	return f?-sum:sum;
}
int main(){
	freopen("Sequence.in.in","r",stdin);freopen("Sequence.in.out","w",stdout);
	t=read();
	while(t--)
	{
		m=read(),k=read();n=0;
		for(int i=1;i<=k;i<<=1)
			if(k&i)
				m-=a[++n]=(1<<i)-1;
		if(m<0){printf("-1\n");continue;}
		if(m==1)
			if(a[1]^1){printf("-1\n");continue;}
			else a[1]=2,m--;
		if(!m)
		{
			printf("%d\n",n);
			for(int i=1;i<=n;i++)
				printf("%d ",a[i]);
			printf("\n");
			continue;
		}
		k=0;
		for(int i=1;i<=m;i<<=1)
			if(m&i)
				a[++n]=i,k++;
		if(k&1)a[n]=a[n+1]=a[n]>>1,n++;
		printf("%d\n",n);
		for(int i=1;i<=n;i++){printf("%d ",a[i]);}
		printf("\n");
	}
	return 0;
}