Grand is similar to Important. Important is derived from Import. Import is a synonym of Consequence. Consequence is a type of Result. 
you are likely to find Police in/at/on Town. Town can be used for Convenience. Person wants (to) Convenience. Person is related to Tough. 
Grand <--SimilarTo--> Important --DerivedFrom--> Import <--Synonym--> Consequence --IsA--> Result 
Police --AtLocation--> Town --UsedFor--> Convenience <--Desires-- Person <--RelatedTo--> Tough 