Mild is a synonym of Pleasant. Sex can be Pleasant. 
Lid is related to Can. you are likely to find Can in/at/on Trash. Trash is a type of Garbage. Garbage is the opposite of Artifact. 
Mild <--Synonym--> Pleasant <--HasProperty-- Sex 
Lid <--RelatedTo--> Can --AtLocation--> Trash --IsA--> Garbage <--Antonym--> Artifact 