Steel is related to Rail. Railroad is derived from Rail. Railroad is a type of Transport. Helicopter can be used for Transport. 
you are likely to find Audience in/at/on Presentation. Audience is related to Human. Human is related to Care. Care is a synonym of Maintenance. 
Steel <--RelatedTo--> Rail <--DerivedFrom-- Railroad --IsA--> Transport <--UsedFor-- Helicopter 
Presentation <--AtLocation-- Audience <--RelatedTo--> Human <--RelatedTo--> Care <--Synonym--> Maintenance 