Area is related to Porch. you are likely to find Plant in/at/on Porch. Plant is part of Ecosystem. 
Assign is a synonym of Commission. Commission is a type of Command. Command is a synonym of Appointment. 
Area <--RelatedTo--> Porch <--AtLocation-- Plant --PartOf--> Ecosystem 
Assign <--Synonym--> Commission --IsA--> Command <--Synonym--> Appointment 