Minor is similar to Secondary. Secondary is similar to Alternative. Alternative is related to Propose. 
Flat is related to Ground. Ground is related to Yard. Yard is related to Outdoor. 
Minor <--SimilarTo--> Secondary <--SimilarTo--> Alternative <--RelatedTo--> Propose 
Flat <--RelatedTo--> Ground <--RelatedTo--> Yard <--RelatedTo--> Outdoor 