treat thick imperf
A low  8  
A low  7  
A low  6  
A low  6  
A low  3
A high 4  
A high 7  
A high 2  
A high 3  
A high 4
B low  9  
B low  9  
B low  8  
B low  14 
B low  8
B high 13 
B high 11 
B high 5  
B high 7  
B high 6