T=int(input())

for tests in range(T):
    N,X=map(int,input().split())
    ANS=[0]*N

    if (1+N)*N//2>X:
        print(-1)
        continue

    for i in range(N):
        NG=N-i-1
        if i==0:
            OK=10**18
        else:
            OK=ANS[i-1]-1

        while OK>NG+1:
            #print(i,OK,NG)
            mid=(OK+NG)//2

            S=X-mid
            L=N-i-1

            #print(S,mid,i,((mid-1)+(mid-1-(L-1)))*L//2)

            if S<=((mid-1)+(mid-1-(L-1)))*L//2:
                OK=mid
            else:
                NG=mid

        #print("!",OK,NG)

        ANS[i]=OK
        X-=OK

    print(*ANS)