Hall is related to Gathering. Building is a type of Gathering. Building is related to Ruin. Ruin is related to Disaster. 
Notice is a type of React. Notice is a synonym of Mark. 
Hall <--RelatedTo--> Gathering <--IsA-- Building <--RelatedTo--> Ruin <--RelatedTo--> Disaster 
React <--IsA-- Notice <--Synonym--> Mark 