Observation is related to Examination. Examination is related to Office. you are likely to find Telephone in/at/on Office. 
Dance is related to While. While is a type of Time. Time is related to Endless. 
Observation <--RelatedTo--> Examination <--RelatedTo--> Office <--AtLocation-- Telephone 
Dance <--RelatedTo--> While --IsA--> Time <--RelatedTo--> Endless 