Look is related to Style. Style is related to Ground. you are likely to find Garden in/at/on Ground. you are likely to find Mouse in/at/on Garden. 
Necessary is a synonym of Natural. Natural is a synonym of Normal. 
Look <--RelatedTo--> Style <--RelatedTo--> Ground <--AtLocation-- Garden <--AtLocation-- Mouse 
Necessary <--Synonym--> Natural <--Synonym--> Normal 