#hierarchy  a series of ordered groupings of people or things within a system: "put honesty first in her hierarchy of values"
  supertype:  series  similar things placed in order or happening one after another; "they were investigating a series of bank robberies"
  subtype:  taxonomy.hierarchy  data_hierarchy
  part of:  system  a group of independent but interrelated elements comprising a unified whole; "a vast system of production and distribution and consumption keep the country going"

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