System is related to Computer. you are likely to find Computer in/at/on Demonstration. you are likely to find Information in/at/on Demonstration. Information can cause/lead to Understanding. 
you are likely to find Grave in/at/on Funeral. Killing can cause/lead to Funeral. Soldier can be used for Killing. Soldier is related to Fighting. 
System <--RelatedTo--> Computer --AtLocation--> Demonstration <--AtLocation-- Information --Causes--> Understanding 
Grave --AtLocation--> Funeral <--Causes-- Killing <--UsedFor-- Soldier <--RelatedTo--> Fighting 