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  $:  edg/_80                                           ::  terminal columns
      off/@ud                                           ::  window offset
      kil/kill                                          ::  kill buffer
      inx/@ud                                           ::  ring index
      fug/(map gill:gall (unit target))                ::  connections
      mir/(pair @ud stub:dill)                         ::  mirrored terminal
  ==                                                    ::
++  history                                             ::  past input
  $:  pos/@ud                                           ::  input position
      num/@ud                                           ::  number of entries
      lay/(map @ud (list @c))                           ::  editing overlay
      old/(list (list @c))                              ::  entries proper
  ==                                                    ::
++  search                                              ::  reverse-i-search
  $:  pos/@ud                                           ::  search position
      str/(list @c)                                     ::  search string
  ==                                                    ::
++  target                                              ::  application target
  $:  $=  blt                                           ::  curr & prev belts
        %+  pair
          (unit dill-belt:dill)