diff --git a/index.yml b/index.yml
index 369c9d4..cd95cc0 100644
--- a/index.yml
+++ b/index.yml
@@ -17,7 +17,25 @@
           sub:
             - opamp
 
-        #- WIS20
+
+      - lable: WIS20
+        sidebar:
+          - lable: formuleblad
+            url: formuleblad.html
+          - lable: diffrencieren
+            url: diffrencieeren.html
+          - lable: supsitutsie
+            url: supsitutsie.html
+          - lable: breuksplitsen
+            url: breuksplitsen.html
+          - lable: parsiele int.
+            url: parsiel.html
+          - lable: fourier transform
+            url: fourier-transformatie.html
+          - lable: divrenciaal vergeleiking
+            url: difrenciaal-vergeleiking.html
+          - lable: 2de Orde DV
+            url: 2de-orde-dv.html
         - EMS10 #empty
         - PEE20 #empty
         - lable: EPS10
@@ -63,32 +81,21 @@
         #- DIS10
         #- EPS20
         - PEE40 #empty
-        #- TEL10
+        - lable: TEL10
+          sidebar:
+            - lable: index
+              url: .
+            # - lable: week 4.1
+            #   url: week-1.html
+            - lable: 4.2 theorie
+              url: week-2.html
+            - lable: 4.3 lab
+              url: week-3.html
+            - lable: 4.5 theorie
+              url: week-5.html
 
         - lable: Fablab making
           url: fablab-making.html
-    - lable: WIS20
-      sidebar:
-        - lable: Diffrencieren
-          url: diffrencieeren.html
-        - lable: Supsitutsie
-          url: supsitutsie.html
-        - lable: Breuksplitsen
-          url: breuksplitsen.html
-        - lable: Parsiele int.
-          url: parsiel.html
-        - lable: Fourier transform
-          url: fourier-transformatie.html
-        - lable: Divrenciaal vergeleiking
-          url: difrenciaal-vergeleiking.html
-        - lable: 2de Orde DV
-          url: 2de-orde-dv.html
-    - lable: WIS20-2
-      sidebar:
-        - lable: index
-          url: .
-        - lable: formuleblad
-          url: formuleblad.html
 
     - lable: ANE10
       url: ANE10-2
@@ -109,17 +116,27 @@
         - lable: opgavens
           url: opgaves.html
         - lable: 3.1 theorie
-          url: week-1.html
+          url: week-3.1.html
         - lable: 3.2 theorie
-          url: week-2.html
+          url: week-3.2.html
         - lable: 3.3 theorie
-          url: week-3.html
-        - lable: 3.4 theorie
-          url: week-4.html
+          url: week-3.3.html
+        - lable: 3.4 lab
+          url: week-3.4.html
         - lable: 3.5 theorie
-          url: week-5.html
+          url: week-3.5.html
+        - lable: 3.7 lab
+          url: week-3.7.html
         - lable: 4.1 lab
-          url: lab2-1.html
+          url: week-4.1.html
+        - lable: 4.3 lab
+          url: week-4.3.html
+        - lable: 4.4 theorie
+          url: week-4.4.html
+        - lable: 4.5 theorie
+          url: week-4.5.html
+        - lable: 4.7 lab
+          url: week-5.5.html
     - lable: EPS20
       sidebar:
         - lable: index
@@ -128,13 +145,7 @@
           url: week-1.html
         - lable: lab 1
           url: lab-1.html
-    - lable: TEL10
-      sidebar:
-        - lable: index
-          url: .
-        - lable: week 4.1
-          url: week-1.html
-        - lable: week 4.2
+        - lable: week 2
           url: week-2.html
 - lable: Toki Pona
   url: tokipona
diff --git a/renderMD.py b/renderMD.py
index 55a0f7e..b5b3142 100644
--- a/renderMD.py
+++ b/renderMD.py
@@ -7,6 +7,8 @@ def renderLatex(code):
   code = code.strip()
   code = code.replace("=>", "\\Rightarrow")
   code = code.replace("->", "\\rightarrow")
+  code = code.replace("\\(", "\\left(")
+  code = code.replace("\\)", "\\right)")
   code = code.replace("*", "\\cdot")
 
   a = re.search(r"{[^{}]*} */ *{[^{}]*}", code)