Round is related to Pipe. Drain is a type of Pipe. Drain is related to Water. 
Matter is related to Term. Term is related to Add. Addition is derived from Add. Addition is related to Porch. 
Round <--RelatedTo--> Pipe <--IsA-- Drain <--RelatedTo--> Water 
Matter <--RelatedTo--> Term <--RelatedTo--> Add <--DerivedFrom-- Addition <--RelatedTo--> Porch 