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preorder (278B)

      1 # Preorder
      2 
      3 https://en.wikipedia.org/wiki/Preorder
      4 
      5 A [binary_relation] which is [transitive] and [reflexive] but not necessarily [antisymmetric]
      6 
      7 May be [total_relation] or not, if it is total then it is a [total_order] except that there are "ties"
      8 
      9 Up: [ddal_seminar_vincent]