Internal is a synonym of Inner. Inner is related to Voice. you are likely to find Voice in/at/on Telephone. you are likely to find Telephone in/at/on Office. 
Tail is related to Rope. Rope is related to Drop. Drop is a synonym of Spend. Spending is a form of Spend. 
Internal <--Synonym--> Inner <--RelatedTo--> Voice --AtLocation--> Telephone --AtLocation--> Office 
Tail <--RelatedTo--> Rope <--RelatedTo--> Drop <--Synonym--> Spend <--FormOf-- Spending 