Root is a synonym of Solution. Solution is a synonym of Resolution. 
Air is related to Pollution. you are likely to find Pollution in/at/on Street. you are likely to find House in/at/on Street. House is related to Cottage. 
Root <--Synonym--> Solution <--Synonym--> Resolution 
Air <--RelatedTo--> Pollution --AtLocation--> Street <--AtLocation-- House <--RelatedTo--> Cottage 