题目描述
Given two numbers A and B. Find the value of pair (P,Q) such that A ≤ P < Q ≤ B value of P AND Q is maximum where AND is a binary operator. Refer to this link for more information about AND operator : http://en.wikipedia.org/wiki/Bitwise_operation#AND
Input:
First line of input contains number of test cases T. Each test case contains two numbers A and B.
Output:
For each test case print the value of maximum AND.
*Constraints: *
1 ≤ T ≤ 1000
1 ≤ A < B ≤10^18
SAMPLE INPUT
2
2 3
4 8
SAMPLE OUTPUT
2
6
输入格式
见题面
输出格式
见题面
样例输入
2
2 3
4 8
SAMPLE
样例输出
2
6