Placement is derived from Place. Market is a type of Place. Market is related to Wall. 
Helpful is related to Useful. Useful is related to Bolt. Bolt is related to Mechanical. 
Placement --DerivedFrom--> Place <--IsA-- Market <--RelatedTo--> Wall 
Helpful <--RelatedTo--> Useful <--RelatedTo--> Bolt <--RelatedTo--> Mechanical 