Transportation is related to Bus. you are likely to find Air in/at/on Bus. 
Production is related to Output. Output is related to Milk. Milk is related to Wave. Wave is related to Formation. 
Transportation <--RelatedTo--> Bus <--AtLocation-- Air 
Production <--RelatedTo--> Output <--RelatedTo--> Milk <--RelatedTo--> Wave <--RelatedTo--> Formation 