Highway is related to Sign. Sign is related to Writing. Pencil can be used for Writing. you are likely to find Pencil in/at/on Pocket. 
Base is related to Air. Air is related to Radio. Radio is related to Device. Device is related to Camera. 
Highway <--RelatedTo--> Sign <--RelatedTo--> Writing <--UsedFor-- Pencil --AtLocation--> Pocket 
Base <--RelatedTo--> Air <--RelatedTo--> Radio <--RelatedTo--> Device <--RelatedTo--> Camera 