Rebuild is a type of Construct. Construct is related to Bridge. you are likely to find Echo in/at/on Bridge. 
Concentration is a type of Increase. Increase is related to Big. Big is related to Car. Car is related to Cover. 
Rebuild --IsA--> Construct <--RelatedTo--> Bridge <--AtLocation-- Echo 
Concentration --IsA--> Increase <--RelatedTo--> Big <--RelatedTo--> Car <--RelatedTo--> Cover 