Must is related to Condition. Decline is a type of Condition. Decline is related to Protest. 
Database is related to Join. Join is related to Meet. Cluster is a type of Meet. 
Must <--RelatedTo--> Condition <--IsA-- Decline <--RelatedTo--> Protest 
Database <--RelatedTo--> Join <--RelatedTo--> Meet <--IsA-- Cluster 