The difference between 91 and 91 is: 
The difference between 51 and 46 is: 
The difference between 99 and 91 is: 
The difference between 91 and 90 is: 
The difference between 91 and 91 is: 
The difference between 91 and 71 is: 
The difference between 94 and 98 is: 
The difference between 91 and 91 is: 