T = int(input())
query = []
for i in range(T):
    n,x = map(int,input().split())
    query.append([n,x])

for t in range(T):
    N,X = query[t][0],query[t][1]
    if X < N*(N+1)//2:
        print(-1)
        continue
    ans = list(range(1,N+1))
    ans[-1] = X - (N*(N+1)//2 - N)
    print(*ans)