## Day 29: Bitwise AND

**Objective**

Welcome to the last day! Today, we're discussing bitwise operations. Check out the Tutorial tab for learning materials and an instructional video!

**Task**

Given set . Find two integers, and (where ), from set such that the value of is the maximum possible *and also less than a given integer, *. In this case, represents the *bitwise AND* operator.

**Input Format**

The first line contains an integer, , the number of test cases.

Each of the subsequent lines defines a test case as space-separated integers, and , respectively.

**Constraints**

**Output Format**

For each test case, print the maximum possible value of on a new line.

**Sample Input**

```
3
5 2
8 5
2 2
```

**Sample Output**

```
1
4
0
```

**Explanation**

All possible values of and are:

The maximum possible value of that is also is , so we print on a new line.