#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"
  part of:  system
  subtype:  taxonomy.hierarchy  a classification of organisms into groups based on similarities of structure or origin etc
  subtype:  data_hierarchy  an arrangement of data consisting of sets and subsets such that every subset of a set is of lower rank than the set

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