Planner is a type of Notebook. Cover is part of Notebook. 
Grave is related to Monument. Monument is related to Large. Large is related to Branch. Branch is related to Split. 
Planner --IsA--> Notebook <--PartOf-- Cover 
Grave <--RelatedTo--> Monument <--RelatedTo--> Large <--RelatedTo--> Branch <--RelatedTo--> Split 