diff --git a/src/lsystem/engine/Rewrite.java b/src/lsystem/engine/Rewrite.java
index 4a2c74f..6fc4696 100644
--- a/src/lsystem/engine/Rewrite.java
+++ b/src/lsystem/engine/Rewrite.java
@@ -2,6 +2,7 @@ package lsystem.engine;
 
 import lsystem.utils.Pair;
 
+import java.util.Arrays;
 import java.util.List;
 
 public class Rewrite {
@@ -16,13 +17,29 @@ public class Rewrite {
         this.recurrences = recurrences;
     }
 
+
+    private String replaceRulesByID(final String rewritted) {
+        String toRewrite = rewritted;
+        for(int j = 0; j < rules.size(); ++j){
+            Pair<String, String> pair = rules.get(j);
+            toRewrite = toRewrite.replace(pair.getLeft(), "$" + j);
+        }
+        return toRewrite;
+    }
+
+    private String replaceIDByRuleApplication(final String toRewrite) {
+        String rewritted = toRewrite;
+        for(int j = 0; j < rules.size(); ++j){
+            rewritted = rewritted.replace("$" + j, rules.get(j).getRight());
+        }
+        return rewritted;
+    }
+
     public String rewrite() {
         String rewritted = axiom;
         for(int i = 0; i < recurrences; ++i) {
-            for(int j = 0; j < rules.size(); ++j){
-                Pair<String, String> pair = rules.get(j);
-                rewritted = rewritted.replace(pair.getLeft(), pair.getRight());
-            }
+            String toRewrite = replaceRulesByID(rewritted);
+            rewritted = replaceIDByRuleApplication(toRewrite);
         }
         return rewritted;
     }