Seat is a type of Support. Rest is a type of Support. Rest is related to Highway. 
Edge is a type of Slip. Slip is related to Light. Light is related to Silk. Silk is related to Pretty. 
Seat --IsA--> Support <--IsA-- Rest <--RelatedTo--> Highway 
Edge --IsA--> Slip <--RelatedTo--> Light <--RelatedTo--> Silk <--RelatedTo--> Pretty 