Machine is a type of Artifact. Artifact is a type of Whole. Whole is the opposite of Half. 
Prompt is a type of Inform. Introduce is a type of Inform. Introduce is related to Time. 
Machine --IsA--> Artifact --IsA--> Whole <--Antonym--> Half 
Prompt --IsA--> Inform <--IsA-- Introduce <--RelatedTo--> Time 