Sentence is part of Speech. you are likely to find Space in/at/on Sentence. Space is related to Apartment. 
Company is related to Small. Small is related to Stem. Stem is a type of Check. 
Speech <--PartOf-- Sentence <--AtLocation-- Space <--RelatedTo--> Apartment 
Company <--RelatedTo--> Small <--RelatedTo--> Stem --IsA--> Check 