Factor is related to Math. Math is related to Measure. Measure is related to Count. 
Bell is related to Save. Save is related to Reserve. Reserve is related to Oil. Oil is related to Become. 
Factor <--RelatedTo--> Math <--RelatedTo--> Measure <--RelatedTo--> Count 
Bell <--RelatedTo--> Save <--RelatedTo--> Reserve <--RelatedTo--> Oil <--RelatedTo--> Become 