#緑以下K

sig = lambda x: x*(x+1)//2

for _ in range(int(input())):
    N,X = map(int,input().split())
    if sig(N) > X: print(-1); continue

    #t-N+1, t-N+2, ... , t がX以上となる最小のtを探す
    ok,ng = 10**18,N-1
    while abs(ok-ng)>1:
        mid = (ok+ng)//2
        if sig(mid) - sig(mid-N) >= X:
            ok,ng = mid,ng
        else: ok,ng = ok,mid
    A = [i for i in range(ok,ok-N,-1)]
    diff = sum(A)-X
    for i in range(diff): A[-i-1]-=1
    print(*A)