Fundamental is similar to Basic. Basic is related to Bread. you are likely to find Bread in/at/on Market. Market is related to District. 
Period is related to Unit. Unit is related to Colony. 
Fundamental <--SimilarTo--> Basic <--RelatedTo--> Bread --AtLocation--> Market <--RelatedTo--> District 
Period <--RelatedTo--> Unit <--RelatedTo--> Colony 