OK
With crashes
Empty
1 1 - 1, 2, 3, 4; 2 - 1, 2, 3, 4    
2 1 - 1, 2, 3, 4; 2 - 1, 2, 3, 4    
3 1 - 1, 3, 4; 2 - 1, 3 1 - 2; 2 - 2, 4  
4 1 - 1 (?), 2 (?), 4 (?); 2 - 1, 2, 3 1 - 3 (?); 2 - 4  
5 2 - 1, 2, 3, 4 1 - 1, 2, 3, 4 (2 days !) 1 - 1, 2, 3, 4; 2 - 1, 2, 3, 4 (on 7/28)
6 1 - 1, 2, 4; 2 - 1, 2, 3, 4 1 - 3  
7 1 - 1, 2; 2 - 1, 2, 3, 4 1 - 3, 4  
8 1 - 1; 2 - 1, 2, 3, 4 1 - 2, 3, 4  
9 1 - 1, 2, 3, 4; 2 - 1, 2, 3, 4    
10     1 - 1, 2, 3, 4; 2 - 1, 2, 3, 4
11 1 - 1, 2, 3, 4; 2 - 1, 2, 3, 4    
12     1 - 1, 2, 3, 4; 2 - 1, 2, 3, 4
13     1 - 1, 2, 3, 4; 2 - 1, 2, 3, 4
14     1 - 1, 2, 3, 4; 2 - 1, 2, 3, 4
15     1 - 1, 2, 3, 4; 2 - 1, 2, 3, 4
16     1 - 1, 2, 3, 4; 2 - 1, 2, 3, 4