dot fix and updated intro nb

src/kyupy/circuit.py

@@ -669,13 +669,16 @@ class Circuit:
                     ins = '|'.join([f'<i{i}>{i}' for i in range(len(n.ins))])
                     outs = '|'.join([f'<o{i}>{i}' for i in range(len(n.outs))])
                     io = f' [{s_dict[n]}]' if n in s_dict else ''
-                    s.node(name=str(n.index), label = f'{{{{{ins}}}|{n.index}{io}\n{n.kind}\n{n.name}|{{{outs}}}}}', shape='record')
+                    s.node(name=str(n.index), label = fr'{{{{{ins}}}|{n.index}{io}\n{n.kind}\n{n.name}|{{{outs}}}}}', shape='record')
 
         for l in self.lines:
             driver, reader = f'{l.driver.index}:o{l.driver_pin}', f'{l.reader.index}:i{l.reader_pin}'
-            if node_level[l.driver] >= node_level[l.reader]:
+            if node_level[l.driver] == node_level[l.reader]:
+                s.node(f'_{l.index}_')
+                dot.edge(driver, f'_{l.index}_', style='dotted', label=str(l.index))
+                dot.edge(f'_{l.index}_', reader, style='dotted', label=str(l.index))
+            elif node_level[l.driver] > node_level[l.reader]:
                 dot.edge(driver, reader, style='dotted', label=str(l.index))
-                pass
             else:
                 dot.edge(driver, reader, label=str(l.index))