Eliminating Redundant Rules

Here's a topic that will probably make your brain hurt> Given this set of 12 rules:

R1 DT1: if color in ['brown'..'violet'] then price is 5    
R2 DT1: if color in ['red'..'teal'] and size = 'large' then price is 5    
R3 DT1: if color = 'red' and shape = 'round' then price is 5    
R4 DT1: if color = 'green' and size = 'small' and shape = 'square' then price is 10    
R5 DT1: if color = 'green' and size = 'large' and shape = 'square' then price is 10    
R6 DT1: if color = 'green' and size = 'large' and shape = 'oval' then price is 10    
R7 DT1: if color = 'green' and size = 'large' and shape = 'square' then price is 10    
R8 DT1: if color = 'green' and size = 'large' and shape = 'oblong' then price is 10    
R9 DT1: if color = 'green' and size = 'large' and shape = 'triangle' then price is 10    

R1 DT2: if color in ['brown'..'violet'] then price is 5    
R2 DT2: if color = 'green' and size = 'small' or  = 'large' and shape = 'square' then price is 10    
R3 DT2: if color = 'green' and size = 'large' and shape = 'oval' or  = 'oblong' or  = 'triangle' then price is 10    

Can they be expressed in fewer rules?

VV says these 12 rules can be replaced by just three:

if color in ['brown'..'violet'] then price is 5    
if color = 'green' and size = 'small' or  = 'large' and shape = 'square' then price is 10    
if color = 'green' and size = 'large' and shape = 'oval' or  = 'oblong' or  = 'triangle' then price is 10 

Do you agree?