#+BEGIN_SRC dot :file diagram1.png :cmdline -Kdot -Tpng
  digraph G {
      rankdir = "LR"
       pre [label="Preprocessor"]                          
       subgraph cluster_inputs {
           label="Inputs"
           rankdir = "TB"
           input1 [label="input"]
           input2 [label="input"]
           input3 [label="∙\n∙\n∙",shape=none]
           input4 [label="input"]
       } -> pre

               pre -> final

               subgraph users {
         rankdir="TB"
         "End Users"
         "Resellers"
         "Corporate Users"
      }

      final -> "End Users"
      final -> "Resellers"
      final -> "Corporate Users"
  }
#+END_SRC

#+BEGIN_SRC dot :file diagram2.png :cmdline -Kdot -Tpng
  digraph G {
      rankdir = "LR"
       pre [label="Preprocessor"]                          
       subgraph cluster_inputs {
           label="Inputs"
           rankdir = "TB"
           input1 [label="input"]
           input2 [label="input"]
           input3 [label="∙\n∙\n∙",shape=none]
           input4 [label="input"]
       } -> pre

       pre -> final

       subgraph users {
         rankdir="TB"
         "End Users"
         "Resellers"
         "Corporate Users"
      }

      final -> "End Users"
      final -> "Resellers"
      final -> "Corporate Users"
  }
#+END_SRC