Solve the programming task below in a Python markdown code block.
The working hours of Chef’s kitchen are from X pm to Y pm (1 ≤ X < Y ≤ 12). 

Find the number of hours Chef works.

------ Input Format ------ 

- The first line of input will contain a single integer T, denoting the number of test cases.
- Each test case consists of two space-separated integers X and Y — the starting and ending time of working hours respectively.

------ Output Format ------ 

For each test case, output on a new line, the number of hours Chef works.

------ Constraints ------ 

$1 ≤ T ≤ 100$
$1 ≤ X < Y ≤ 12$

----- Sample Input 1 ------ 
4
1 2
3 7
9 11
2 10

----- Sample Output 1 ------ 
1
4
2
8

----- explanation 1 ------ 
Test case $1$: Chef starts working at $1$ pm and works till $2$ pm. Thus, he works for $1$ hour.

Test case $2$: Chef starts working at $3$ pm and works till $7$ pm. Thus, he works for $4$ hours.

Test case $3$: Chef starts working at $9$ pm and works till $11$ pm. Thus, he works for $2$ hours.

Test case $4$: Chef starts working at $2$ pm and works till $10$ pm. Thus, he works for $8$ hours.