T=int(input())
answers=[]
for _ in range(T):
    N,X=map(int,input().split())
    ans=[]
    if(X<N*(N+1)//2):
        answers.append([-1])
    else:
        for i in range(N):
            if(i==N-1):
                ans.append(X)
            else:
                ans.append(i+1)
                X-=(i+1)
        answers.append(ans)
for ans in answers:
    print(*ans)