Material is related to Dirt. Dirt is a synonym of Scandal. Politician does not want (to) Scandal. 
Street is related to Town. Town is related to Reading. Reading is related to Educational. Educational is related to Discovery. 
Material <--RelatedTo--> Dirt <--Synonym--> Scandal <--NotDesires-- Politician 
Street <--RelatedTo--> Town <--RelatedTo--> Reading <--RelatedTo--> Educational <--RelatedTo--> Discovery 