#chain__concatenation  a series of things depending on each other as if linked together: "the chain of command"; "a complicated concatenation of circumstances"
  supertype:  #series  similar things placed in order or happening one after another; "they were investigating a series of bank robberies"
  subtype:  #catena  a chain of connected ideas or passages or objects so arranged that each member is closely related to the preceding and following members (especially a series of patristic comments elucidating Christian dogma)

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