Nerve is a type of Cell. Nerve is related to System. System is related to Language. 
Killing can cause/lead to Grief. Killing can be used for Crime. Crime is related to Activity. Activity is related to Smoke. 
Cell <--IsA-- Nerve <--RelatedTo--> System <--RelatedTo--> Language 
Grief <--Causes-- Killing --UsedFor--> Crime <--RelatedTo--> Activity <--RelatedTo--> Smoke 