The difference between 13 and 13 is: 
The difference between 74 and 65 is: 
The difference between 15 and 13 is: 
The difference between 13 and 12 is: 
The difference between 33 and 13 is: 
The difference between 13 and 13 is: 
The difference between 10 and 12 is: 
The difference between 13 and 13 is: 