Problem: You are given two integers n and k. You are asked to choose maximum number of distinct integers from 1 to n so that there is no subset of chosen numbers with sum equal to k.

A subset of a set is a set that can be obtained from initial one by removing some (possibly all or none) elements of it.

Input

The first line contains the number of test cases T (1 ≤ T ≤ 100).

Each of the next T lines contains two integers n and k (1 ≤ k ≤ n ≤ 1000) — the description of test cases.

Output

For each test case output two lines. In the first line output a single integer m — the number of chosen integers.

In the second line output m distinct integers from 1 to n — the chosen numbers.

If there are multiple answers, print any. You can print the numbers in any order.

Example

Input


3
3 2
5 3
1 1


Output


2
3 1 
3
4 5 2 
0

Solution (in PYTHON3):

Solution:
import math
t=int(input())
for q in range(t):
    n,k=map(int,input().split())
    ans=n-math.ceil(k/2)
    print(ans)
    ar=[]
    for i in range(k+1,n+1):
        ar.append(i)
    for i in range(math.ceil(k/2),k):
        ar.append(i)
    for i in range(len(ar)):
        print(ar[i],end=' ')
    print()