import bisect

n = 200001

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:
        a = bisect.bisect_left(acc,X)
        ans = [i for i in range(a+1,0,-1)]
        if acc[a] - X != 0:
            ans.remove(acc[a] - X)
        print(*ans)