Elbow is related to Point. Point is related to Gesture. Wave is a type of Gesture. Wave is related to Action. 
Contributor is a type of Writer. Writer is derived from Write. Write is related to Reply. Reply is related to Say. 
Elbow <--RelatedTo--> Point <--RelatedTo--> Gesture <--IsA-- Wave <--RelatedTo--> Action 
Contributor --IsA--> Writer --DerivedFrom--> Write <--RelatedTo--> Reply <--RelatedTo--> Say 