The difference between 77 and 17 is: 
The difference between 79 and 18 is: 
The difference between 78 and 17 is: 
The difference between 77 and 10 is: 
The difference between 77 and 17 is: 
The difference between 77 and 67 is: 
The difference between 77 and 18 is: 
The difference between 77 and 17 is: 