n = 200002

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

T = int(input())
for _ in range(T):
    N,X = map(int,input().split())
    if acc[N-1] > X:
        print(-1)
    else:
        ans = [i for i in range(N+1,0,-1)]
        if X - acc[N-1] == 0:
            ans.pop(0)
        else:
            ans.remove(acc[N] - X)
        print(*ans)