Harvest is a synonym of Effect. Effect is related to Computer. 
Lead is related to Gasoline. Gas is derived from Gasoline. Eating can cause/lead to Gas. Eating can cause/lead to Death. 
Harvest <--Synonym--> Effect <--RelatedTo--> Computer 
Lead <--RelatedTo--> Gasoline <--DerivedFrom-- Gas <--Causes-- Eating --Causes--> Death 