It is less on EE cos, it is a mix of the green and red, eg on red you might use you HEX B on potatoes on ee you dont need to cos you can have them freely
Its actually 2 HexB on red or green and 1 OR 2 Hex A on red or green. The 2 Hex As are not compulsory - you should definitely have one, but the second is optional. Thats the official line according to the book anyway.