diff --git a/svg-demo/svg_dump.py b/svg-demo/svg_dump.py
index ed579f6..46392c5 100755
--- a/svg-demo/svg_dump.py
+++ b/svg-demo/svg_dump.py
@@ -1,15 +1,17 @@
 #!/usr/bin/env python3
 # -*- coding: utf-8 -*-
 
-CASE_WIDTH = 24
-CASE_HEIGHT = 36
+CASE_WIDTH = 48
+CASE_HEIGHT = 72
 
-CASE_DISTANCE_X = 40
-CASE_DISTANCE_Y = 20
+CASE_DISTANCE_X = 80
+CASE_DISTANCE_Y = 40
 
 MAIN_MARGIN_X = 10
 MAIN_MARGIN_Y = 8
 
+LINK_OFFSET = 1
+
 layer = [
     ["603EDF5CAFFF5E2"], # layer 0
     ["61BEC75CAFFF5E2","0C3EDF5CAFFF5E2"], # layer 1
@@ -61,24 +63,49 @@ def case_address(layer_num: int, layer_index: int) -> (int, int):
     )
 
 
+def link_address(start_layer_num: int, start_layer_index: int, end_layer_num: int, end_layer_index: int) -> (int, int, int, int):
+
+    x1, y1 = case_address(start_layer_num, start_layer_index)
+    x2, y2 = case_address(end_layer_num, end_layer_index)
+
+    return (
+        x1 + int(CASE_WIDTH / 2),
+        y1 + CASE_HEIGHT + LINK_OFFSET,
+        x2 + int(CASE_WIDTH / 2),
+        y2 - LINK_OFFSET,
+    )
+
+
 def svg_rect(left: int, top: int, width: int, height: int):
     return '<rect x="%d" y="%d" width="%d" height="%d" style="fill:pink;stroke-width:2;stroke:rgb(0,0,0)"/>' % (
         left, top, width, height
     )
 
 
-print('<svg xmlns="http://www.w3.org/2000/svg" version="1.1">')
+def svg_line(start_x: int, start_y: int, end_x: int, end_y: int):
+    return '<line x1="%d" y1="%d" x2="%d" y2="%d" style="stroke:black;stroke-width:1"/>' % (
+        start_x, start_y, end_x, end_y
+    )
+
+MAIN_WIDTH = MAX_CASE_X * CASE_WIDTH + (MAX_CASE_X - 1) * CASE_DISTANCE_X + MAIN_MARGIN_X * 2
+MAIN_HEIGHT = MAX_CASE_Y * CASE_HEIGHT + (MAX_CASE_Y - 1) * CASE_DISTANCE_Y + MAIN_MARGIN_Y * 2
+
+print('<svg xmlns="http://www.w3.org/2000/svg" version="1.1" width="%d" height="%d">' % (MAIN_WIDTH, MAIN_HEIGHT))
 
 for layer_num in range(0, len(layer)):
     for layer_index in range(0, len(layer[layer_num])):
         x, y = case_address(layer_num, layer_index)
         print(' ', svg_rect(x, y, CASE_WIDTH, CASE_HEIGHT))
 
+for layer_num in range(0, len(link)):
+    for layer_index in range(0, len(link[layer_num])):
+        for next_index in range(0, len(link[layer_num][layer_index])):
+
+            # print('(%d, %d) -> (%d, %d)' % (layer_num, layer_index, layer_num + 1, next_index))
+            x1, y1, x2, y2 = link_address(layer_num, layer_index, layer_num + 1, next_index)
+            print(' ', svg_line(x1, y1, x2, y2))
 
-# for case in [(0, 0), (1, 0), (1, 1)]: # (layer_num, layer_index)
-#     x, y = case_address(case[0], case[1])
-#
-#     print(' ', svg_rect(x, y, CASE_WIDTH, CASE_HEIGHT))
-    # print(case_address(case[0], case[1]))
+# x1, y1, x2, y2 = link_address(0, 0, 1, 0)
+# print(' ', svg_line(x1, y1, x2, y2))
 
 print('</svg>')