Keep is related to Obtain. Obtain is a synonym of Prevail. Prevail is a synonym of Persist. 
Vegetable is a different concept from Chicken. Chicken is related to Old. Old is related to Tradition. 
Keep <--RelatedTo--> Obtain <--Synonym--> Prevail <--Synonym--> Persist 
Vegetable <--DistinctFrom--> Chicken <--RelatedTo--> Old <--RelatedTo--> Tradition 