Outer is related to Edge. Edge is a type of Slip. Slip is related to Stumble. 
Shell is a type of Part. Part is related to Seed. Seed is a type of Bear. Bear is a type of Investor. 
Outer <--RelatedTo--> Edge --IsA--> Slip <--RelatedTo--> Stumble 
Shell --IsA--> Part <--RelatedTo--> Seed --IsA--> Bear --IsA--> Investor 