Casual is related to Dad. Dad is related to Short. Short is related to Rest. Rest is related to Pillow. 
Retire is related to Rest. Rest is related to Middle. Middle is related to Island. 
Casual <--RelatedTo--> Dad <--RelatedTo--> Short <--RelatedTo--> Rest <--RelatedTo--> Pillow 
Retire <--RelatedTo--> Rest <--RelatedTo--> Middle <--RelatedTo--> Island 