t = int(input())

for i in range(t):
    n,x = map(int,input().split())
    tp = []
    if n == x:
        print(x)
        continue
    for i in range(1,n):
        tp.append(i)
        x -= i
    if x > tp[-1]:
        tp.append(x)
        print(*tp,sep=" ")
    else:
        print(-1)