Link is related to Marriage. Marriage is related to Ceremony. Ceremony is related to Sir. 
Lighting is related to Coal. Coal is a type of Supply. Curtain is a type of Supply. 
Link <--RelatedTo--> Marriage <--RelatedTo--> Ceremony <--RelatedTo--> Sir 
Lighting <--RelatedTo--> Coal --IsA--> Supply <--IsA-- Curtain 