Single is related to Sound. Sound is related to Air. you are likely to find Air in/at/on Bridge. 
you are likely to find Concrete in/at/on Street. you are likely to find Machine in/at/on Street. Machine is related to Tool. Knife is a type of Tool. 
Single <--RelatedTo--> Sound <--RelatedTo--> Air --AtLocation--> Bridge 
Concrete --AtLocation--> Street <--AtLocation-- Machine <--RelatedTo--> Tool <--IsA-- Knife 