Stair is related to Wood. Wood is related to Source. 
Find is related to Shell. Shell is related to Bullet. Bullet is related to Zone. Zone is a synonym of Territory. 
Stair <--RelatedTo--> Wood <--RelatedTo--> Source 
Find <--RelatedTo--> Shell <--RelatedTo--> Bullet <--RelatedTo--> Zone <--Synonym--> Territory 