Crop is related to Rice. Rice is related to Popular. Popular is related to Mainstream. 
Pc is related to Apple. Apple is related to Seed. Seed is related to Dirt. Hole can be used for Dirt. 
Crop <--RelatedTo--> Rice <--RelatedTo--> Popular <--RelatedTo--> Mainstream 
Pc <--RelatedTo--> Apple <--RelatedTo--> Seed <--RelatedTo--> Dirt <--UsedFor-- Hole 