Desk is related to Wooden. Wooden is related to Staff. Staff is related to Musical. 
Date is related to Situation. Element is a type of Situation. Element is part of Set. Solution is a type of Set. 
Desk <--RelatedTo--> Wooden <--RelatedTo--> Staff <--RelatedTo--> Musical 
Date <--RelatedTo--> Situation <--IsA-- Element --PartOf--> Set <--IsA-- Solution 