#pair__brace  a set of two similar things considered as a unit
  supertype:  #set.aggregation  a group of things of the same kind that belong together and are so used: "a set of books"; "a set of golf clubs"; "a set of teeth"
  subtype:  #Tweedledum_and_Tweedledee__Tweedledee_and_Tweedledum  any two people who are hard to tell apart

No statement uses or specializes #pair; click here to add one.