share/rbbt_commands/workflow/prov in rbbt-util-5.23.16 vs share/rbbt_commands/workflow/prov in rbbt-util-5.23.17

@@ -162,10 +162,10 @@
   id, edges, node_info = adjacency(step)
   node_info[id][:color] = 'red'
   TmpFile.with_file do |edge_file|
     Open.write(edge_file) do |f|
       f.puts "from,to"
-      edges.each do |from,to|
+      edges.uniq.each do |from,to|
         f.puts [from,to]*","
       end
     end
     TmpFile.with_file do |node_info_file|
       Open.write(node_info_file) do |f|