Quantity is related to Price. Price is related to Shopping. 
you are likely to find Bacteria in/at/on Lake. Lock is etymologically related to Lake. Lock is related to Bat. Bat is related to Hearing. 
Quantity <--RelatedTo--> Price <--RelatedTo--> Shopping 
Bacteria --AtLocation--> Lake <--EtymologicallyRelatedTo-- Lock <--RelatedTo--> Bat <--RelatedTo--> Hearing 