inputs = input()
inputs_arr = inputs.split(" ")

T = int(inputs_arr[0])
datas = []

for i in range(T):
	inputs = input()
	inputs_arr = inputs.split(" ")
	datas.append([int(inputs_arr[0]), int(inputs_arr[1])])

answer = []

def generate_combinations(numbers, current_combination, remaining_elements, target_sum):
    if remaining_elements == 0:
        if sum(current_combination) == target_sum:
            answer.append(current_combination)
        return
    for i in range(len(numbers)):
        if not current_combination or numbers[i] > current_combination[-1]:
            generate_combinations(numbers, current_combination + [numbers[i]], remaining_elements - 1, target_sum)

for d in datas:
	N = d[0]
	X = d[1]
	display_num = ""

	numbers = list(range(1, int(X/2)))
	combination_size = N
	target_sum = X

	answer = []

	generate_combinations(numbers, [], combination_size, target_sum)

	if len(answer) == 0:
		print("-1")
	else:
		for num in answer[0]:
			display_num = display_num + str(num) + " "

		print(display_num[:-1])