Dock is a type of Landing. Dock is related to Slip. Slip is a type of Sheet. 
Extreme is related to Desire. Desire is related to Sexual. Sexuality is derived from Sexual. 
Landing <--IsA-- Dock <--RelatedTo--> Slip --IsA--> Sheet 
Extreme <--RelatedTo--> Desire <--RelatedTo--> Sexual <--DerivedFrom-- Sexuality 