Weakness is a type of Preference. Weakness is related to Deficit. Deficit is related to Tax. Tax is related to Deadline. 
Person is related to Worker. Worker is related to Nurse. 
Preference <--IsA-- Weakness <--RelatedTo--> Deficit <--RelatedTo--> Tax <--RelatedTo--> Deadline 
Person <--RelatedTo--> Worker <--RelatedTo--> Nurse 