you are likely to find Mouse in/at/on Desk. you are likely to find Mouse in/at/on Trash. Trash is related to Waste. Waste is related to Being. 
you are likely to find Information in/at/on Meeting. you are likely to find Presentation in/at/on Meeting. Presentation is a synonym of Assignment. Assignment is a synonym of Appointment. 
Desk <--AtLocation-- Mouse --AtLocation--> Trash <--RelatedTo--> Waste <--RelatedTo--> Being 
Information --AtLocation--> Meeting <--AtLocation-- Presentation <--Synonym--> Assignment <--Synonym--> Appointment 