Free is related to Library. Library can be Dark. 
Tough is related to Steak. Steak is related to Slice. Slice is related to Pie. Pie is a synonym of Pizza. 
Free <--RelatedTo--> Library --HasProperty--> Dark 
Tough <--RelatedTo--> Steak <--RelatedTo--> Slice <--RelatedTo--> Pie <--Synonym--> Pizza 