Lamp is related to Post. Post is related to Barrier. Barrier is related to Test. Test is related to Tool. 
Cigarette can be used for Burn. Cigarette is related to Smoke. one thing you do when you Smoke is Cancer. 
Lamp <--RelatedTo--> Post <--RelatedTo--> Barrier <--RelatedTo--> Test <--RelatedTo--> Tool 
Burn <--UsedFor-- Cigarette <--RelatedTo--> Smoke --HasSubevent--> Cancer 