{"version":"1.0","type":"link","title":"Nested set collection - Newikis","description":"A nested set collection or nested set family is a collection of sets that consists of chains of subsets forming a hierarchical structure, like Russian dolls.","provider_name":"Newikis","provider_url":"https://newikis.com","cache_age":86400,"thumbnail_url":"https://thumb.wikimedia.org/wikipedia/commons/thumb/d/d2/Russian-Matroshka_no_bg.jpg/1280px-Russian-Matroshka_no_bg.jpg","thumbnail_width":1280,"thumbnail_height":850}