T = int(input())

for _ in range(T):
    N,X = map(int,input().split())
    s = 0
    P = []
    for i in range(N-1):
        P.append(i+1)
        s += (i+1)
    r = X - s
    if len(P) == 0:
        print(X)
    elif r > P[-1]:
        P.append(r)
        print(*P)
    else:
        print(-1)