2 + 2 = 4 
2 + 2 = 4 

so-and-so 
so-and-so 

10 + 10 = 20 
10 + 10 = 20 

3 + 3 = 6 
3 + 3 = 6 

co-owner 
co-owner 

4 + 3 + 2 + 1 = 10 
4 + 3 + 2 + 1 = 10 

old-timer 
old-timer 

5 - 6 = -1 
5 - 6 = -1 

cross-reference 
cross-reference 

by-product 
by-product 

5x - 6y = x + 7 
5x - 6y = x + 7 

non-European 
non-European 

Aix-en-Provence 
Aix-en-Provence 
