It is an easy and neat way to show relationships, whatever they are, between different elements.
Akụkụ ọ bụla dị n'ime ya bụ ihe meghere na -emegharị ihe ọ bụla na-agagharị agagharị, n'agbanyeghịkwa ụdị ọdịdị ya, ụzọ abụọ ahụ dị n'otu.