[rules-users] How to deal with Set inside another Set?

[joeyoungkc]

I have three classes 
Master() 
private Set<Header> Headers; 
---------------------------- 
Header() 
private Set<Line> Lines; 
---------------------------- 
Line() 
private String name; 
---------------------------- 
Master() is the facts.  In my spreadsheet I would like to check the line
name == "abc". How do I do that. 
Here is what I got but it cause type mismatched error!! please help. 

Master() 
$h: Headers 
$L : $h.Lines 
m: Line(<generated by condition header>) from $L 


Please help!! 

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