Sign is a type of Evidence. Sign is related to Public. Public is related to People. you are likely to find People in/at/on Opera. 
Talent is related to Money. Money is related to Company. Company is the opposite of Lonely. 
Evidence <--IsA-- Sign <--RelatedTo--> Public <--RelatedTo--> People --AtLocation--> Opera 
Talent <--RelatedTo--> Money <--RelatedTo--> Company <--Antonym--> Lonely 