Friendly is related to Fellow. Fellow is the opposite of Lady. Lady is related to Statue. 
Desk is related to Flat. Flat is related to Metal. Metal is related to Gun. 
Friendly <--RelatedTo--> Fellow <--Antonym--> Lady <--RelatedTo--> Statue 
Desk <--RelatedTo--> Flat <--RelatedTo--> Metal <--RelatedTo--> Gun 