Be is related to Flying. Flying is related to Wind. Wind is related to Element. Aluminum is a type of Element. 
Crowd is related to Public. Public is related to Sign. Sign can be used for Advertising. 
Be <--RelatedTo--> Flying <--RelatedTo--> Wind <--RelatedTo--> Element <--IsA-- Aluminum 
Crowd <--RelatedTo--> Public <--RelatedTo--> Sign --UsedFor--> Advertising 