Explain is related to Reason. Reason is related to Process. 
Chart is related to Organizational. Organizational is related to Department. Department is related to Station. Station is a synonym of Degree. 
Explain <--RelatedTo--> Reason <--RelatedTo--> Process 
Chart <--RelatedTo--> Organizational <--RelatedTo--> Department <--RelatedTo--> Station <--Synonym--> Degree 