Pond can be used for Fishing. you are likely to find Insect in/at/on Pond. Butterfly is a type of Insect. 
Birthday is related to Self. Self is related to Soap. Soap is related to Shower. Shower is related to Little. 
Fishing <--UsedFor-- Pond <--AtLocation-- Insect <--IsA-- Butterfly 
Birthday <--RelatedTo--> Self <--RelatedTo--> Soap <--RelatedTo--> Shower <--RelatedTo--> Little 