Which program should I enter?

This is an example to show you some of the features of the inference engine.

line 54 Qualifications for CS

AND

general_math_level	=	beta

likes	=	programming

likes	=	computer architecture

Then

program	:=	CS

line 103 Your general math level (less specific, will make other rules easier to write)

math_level	=	B1

math_level	=	B2

math_level	=	D

Then

general_math_level	:=	beta

line 120 If you followed astropyhics or artificial intelligence, we know your math is just fine.

previous_program	=	Artificial Intelligence

previous_program	=	Astrophysics

Then

previous_math_level	:=	beta

line 136 Your general math level stays the same if you followed a previous program at the university.

NOT

previous_program	=	none

Then

general_math_level	:=	$previous_math_level

Trying to solve general_math_level
Found 2 rules and 0 questions
Rule [Rule "Your general math level (less specific, will make other rules easier to write)" (line 103)] results in [Maybe because: [Maybe because: math_level], [Maybe because: math_level], [Maybe because: math_level]]
Rule [Rule "Your general math level stays the same if you followed a previous program at the university." (line 136)] results in [Maybe because: previous_program]
Cannot solve general_math_level because math_level, previous_program are not known yet
Added math_level to the goal stack; the stack is now math_level, general_math_level
Trying to solve math_level
Found 0 rules and 1 questions
This resulted in the question What math level did you follow during highschool? (Old second phase system) (not skippable)