diff --git a/center.md b/center.md
index 047c57040..de5a89ddc 100644
--- a/center.md
+++ b/center.md
@@ -7,8 +7,29 @@
   - #3 https://www.youtube.com/watch?v=XerZZ2gbY38
   - #4 https://www.youtube.com/watch?v=NdH3XeKbhvQ
   - #5 https://www.youtube.com/watch?v=mXG4p5cuR3g
-  - #6 …
+  - #6 https://anagora.org/center
   - #7 https://anagora.org/center
   - #8 https://anagora.org/center
   - #9 https://anagora.org/center
   - #10 https://anagora.org/center
+  - #11 https://anagora.org/center
+  - #12 https://anagora.org/center
+  - #13 https://anagora.org/center
+  - #14 https://anagora.org/center
+  - #15 https://anagora.org/center
+  - #16 https://anagora.org/center
+  - #17 https://anagora.org/center
+  - #18 https://anagora.org/center
+  - #19 https://anagora.org/center
+  - #20 https://anagora.org/center
+  - #21 https://anagora.org/center
+  - #22 https://anagora.org/center
+  - #23 https://anagora.org/center
+  - #24 https://anagora.org/center
+  - #25 https://anagora.org/center
+  - #26 https://anagora.org/center
+  - #27 https://anagora.org/center
+  - #28 https://anagora.org/center
+  - #29 https://anagora.org/center
+  - #30 https://anagora.org/center
+  - #31 https://anagora.org/center