almost equal rules problem

Hello, 
 
Im looking at a nice way to solve this.
 
I have a problem with 2 ways to solve it.
 
Sometimes I need this   rule a and rule 2 so  a,b 
Sometimes I need this  rule1 or rule 2 so a;b 
 
I think I can solve it by using a if then.
 
So like this in pseudo - code. 
 
If waarde = true then a,b else a;b
 
Is there another  maybe better way to solve this.
Im looking at a solution at beginners level so I have not learn things like list or recursion.
 
Roelof
 
 		 	   		  
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