From 8338f54127763c569d4a285a3f53849df629d769 Mon Sep 17 00:00:00 2001
From: Justin Lin <caterpillar@openhome.cc>
Date: Fri, 23 Oct 2020 15:06:46 +0800
Subject: [PATCH] fix rules

---
 examples/turtle/lsystem2_collection.scad | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/examples/turtle/lsystem2_collection.scad b/examples/turtle/lsystem2_collection.scad
index 0e24ed3e..7cede162 100644
--- a/examples/turtle/lsystem2_collection.scad
+++ b/examples/turtle/lsystem2_collection.scad
@@ -116,10 +116,10 @@ function dragon_curve(n = 10, angle = 90, leng = 1, heading = 0, start = [0, 0])
 
 function twin_dragon_curve(n = 8, angle = 90, leng = 1, heading = 0, start = [0, 0]) = 
     let(
-        axiom = "FX+FX+",
+        axiom = "FX+FX",
         rules = [
             ["X", "X+YF"],
-            ["Y", "Y=FX-Y"]
+            ["Y", "FX-Y"]
         ]
     )
     lsystem2(axiom, rules, n, angle, leng, heading, start);