Dirt is related to Hill. Hill can be Tall. Tall is related to Bishop. Bishop can be used for Kill. 
Abortion is a type of Issue. Abortion is a type of Disease. Corn is a type of Disease. 
Dirt <--RelatedTo--> Hill --HasProperty--> Tall <--RelatedTo--> Bishop --UsedFor--> Kill 
Issue <--IsA-- Abortion --IsA--> Disease <--IsA-- Corn 