Bush is related to Politician. Politician is related to Government. Government is related to Corruption. 
Roll is related to Like. Like is related to Particular. Particular is similar to Careful. Climb requires Careful. 
Bush <--RelatedTo--> Politician <--RelatedTo--> Government <--RelatedTo--> Corruption 
Roll <--RelatedTo--> Like <--RelatedTo--> Particular <--SimilarTo--> Careful <--HasPrerequisite-- Climb 