Landmark can be used for Orientation. Quarter is a type of Orientation. Stone is part of Quarter. 
Communicate requires Listen. Listen is related to Work. one thing you do when you Work is Plan. Plan is related to Perfect. 
Landmark --UsedFor--> Orientation <--IsA-- Quarter <--PartOf-- Stone 
Communicate --HasPrerequisite--> Listen <--RelatedTo--> Work --HasSubevent--> Plan <--RelatedTo--> Perfect 