Sex can be Painful. Couch can be used for Sex. Couch is related to Sofa. Sofa is a type of Furniture. 
Cigarette is related to Match. Match is related to Sock. Sock is related to Clothes. Clothes is related to Fur. 
Painful <--HasProperty-- Sex <--UsedFor-- Couch <--RelatedTo--> Sofa --IsA--> Furniture 
Cigarette <--RelatedTo--> Match <--RelatedTo--> Sock <--RelatedTo--> Clothes <--RelatedTo--> Fur 