School is related to Required. Required is a synonym of Due. Due is related to Timing. 
Close is a type of End. End is a type of Surface. Surface is related to Desk. you are likely to find Light in/at/on Desk. 
School <--RelatedTo--> Required <--Synonym--> Due <--RelatedTo--> Timing 
Close --IsA--> End --IsA--> Surface <--RelatedTo--> Desk <--AtLocation-- Light 