class Input_kyopro:
    def II(self): return int(input())
    def MI(self): return map(int,input().split())
    def MS(self): return map(str,input().split())
    def LMI(self): return list(self.MI())
    def LMS(self): return list(self.MS())
    def LLI(self,N): return [self.LMI() for _ in range(N)]
    def LLS(self,N): return [self.LMS() for _ in range(N)]
    def LS(self,N): return [input() for _ in range(N)]
    def LSL(self,N): return [list(input()) for _ in range(N)]
    def LI(self,N): return [self.II() for _ in range(N)]
I=Input_kyopro()
#入力
T=I.II()
for _ in range(T):
    N,X=I.MI()
    tmp=0
    for i in range(N):
        tmp+=i+1
    if tmp<=X:
        tmp=0
        for i in range(N-1):
            print(i+1)
            tmp+=i+1
        print(X-tmp)
    else:
        print(-1)