Activity is related to Dancer. Dancer is related to Person. Fish is a type of Person. Fish is related to Place. 
Tobacco is related to Smoke. Smoke is related to Habit. Habit is related to Drinking. 
Activity <--RelatedTo--> Dancer <--RelatedTo--> Person <--IsA-- Fish <--RelatedTo--> Place 
Tobacco <--RelatedTo--> Smoke <--RelatedTo--> Habit <--RelatedTo--> Drinking 