Stair is related to Wood. Wood is related to Matter. Matter is a synonym of Count. 
Mail is a type of Transfer. Transfer is related to Move. Move is related to Crawl. 
Stair <--RelatedTo--> Wood <--RelatedTo--> Matter <--Synonym--> Count 
Mail --IsA--> Transfer <--RelatedTo--> Move <--RelatedTo--> Crawl 