Carbohydrate is related to Grain. Grain is related to Ingredient. 
Inner is related to Hall. Hall is related to Lobby. you are likely to find Lobby in/at/on Opera. Act is part of Opera. 
Carbohydrate <--RelatedTo--> Grain <--RelatedTo--> Ingredient 
Inner <--RelatedTo--> Hall <--RelatedTo--> Lobby --AtLocation--> Opera <--PartOf-- Act 