Tower is related to Bell. Bell is related to Item. Item is related to Trick. Trick is related to Slight. 
Roll is a type of List. Rim is a type of Roll. Rim is related to Glass. Glass is related to Telescope. 
Tower <--RelatedTo--> Bell <--RelatedTo--> Item <--RelatedTo--> Trick <--RelatedTo--> Slight 
List <--IsA-- Roll <--IsA-- Rim <--RelatedTo--> Glass <--RelatedTo--> Telescope 