n = 10000

acc = [1 for _ in range(n)]
for j in range(1,n):
    acc[j] = acc[j-1] + j + 1

T = int(input())
nx = [None for _ in range(T)]
for t in range(T):
    nx[t] = list(map(int,input().split()))
for j in range(T):
    N,X = nx[j][0],nx[j][1]
    if acc[N-1] > X:
        print(-1)
    else:
        ans = [i for i in range(1,N+1)]
        ans[-1] += (X - acc[N-1])
        print(*ans)