#include<bits/stdc++.h>
using namespace std;
#define ll long long
#define ss second
#define ff first
#define pb push_back
const ll mxn=2e5+5;
const int mod=998244353;
int main(){
ios_base::sync_with_stdio(false);
cin.tie(0);
cout.tie(0);
ll t;
cin>>t;
while(t--) {
ll n,x;
cin>>n>>x;
if(n==1) {
cout<<x<<"\n";
continue;
}
ll m0=0;
while(true) {
if((m0&(~x))!=0) break;
m0++;
}
ll k=min(n,m0);
vector<ll> v;
for(ll i=0; i<k; i++) v.pb(i);
ll c=0;
for(auto a:v) c|=a;
if(c==x) {
while(v.size()<n) v.pb(0);
} else {
if(n>k) {
v.pb(x);
while(v.size()<n) v.pb(0);
} else {
v[k-1]=x;
}
}
for(auto a:v) cout<<a<<" ";
cout<<"\n";
}
}
