you are likely to find Class in/at/on School. School is a synonym of Educate. 
Ready is related to Fire. Fire is related to Shoot. Pistol can be used for Shoot. Pistol can be Dangerous. 
Class --AtLocation--> School <--Synonym--> Educate 
Ready <--RelatedTo--> Fire <--RelatedTo--> Shoot <--UsedFor-- Pistol --HasProperty--> Dangerous 