Material is related to Glass. Glass is related to Lens. you are likely to find Lens in/at/on Telescope. Telescope is related to Astronomer. 
Ground is related to Army. Army is related to Attack. Attack is related to Invasion. 
Material <--RelatedTo--> Glass <--RelatedTo--> Lens --AtLocation--> Telescope <--RelatedTo--> Astronomer 
Ground <--RelatedTo--> Army <--RelatedTo--> Attack <--RelatedTo--> Invasion 