Net can be used for Tennis. Net is related to Fish. Line can be used for Fish. 
Season is a type of Weather. you are likely to find Grape in/at/on Season. you are likely to find Grape in/at/on Diet. 
Tennis <--UsedFor-- Net <--RelatedTo--> Fish <--UsedFor-- Line 
Weather <--IsA-- Season <--AtLocation-- Grape --AtLocation--> Diet 