Oak is a type of Species. Species is related to Man. Man is related to Artificial. 
Basketball is related to Heat. Heat is related to Output. Output is related to Current. Current is related to Relevant. 
Oak --IsA--> Species <--RelatedTo--> Man <--RelatedTo--> Artificial 
Basketball <--RelatedTo--> Heat <--RelatedTo--> Output <--RelatedTo--> Current <--RelatedTo--> Relevant 