diff --git a/session3 b/session3
index 9cf6bcb..3dc3f0d 160000
--- a/session3
+++ b/session3
@@ -1 +1 @@
-Subproject commit 9cf6bcb285262c25b4e5cc0fedb353e7953308e6
+Subproject commit 3dc3f0dd5eabdfccc5b2a666e87358e0acabc3fd
diff --git a/session4 b/session4
index 71f4698..0c99ac6 160000
--- a/session4
+++ b/session4
@@ -1 +1 @@
-Subproject commit 71f469840c12cafdeb96fd26b61f91447539d60e
+Subproject commit 0c99ac6df96944c3f06038d70bb03c8aab32e78c
diff --git a/session6 b/session6
index 45d1c80..d517603 160000
--- a/session6
+++ b/session6
@@ -1 +1 @@
-Subproject commit 45d1c8013fb50098cdab92f3aff1d6d49437a758
+Subproject commit d5176035965b9214d69dc748fcc5f7b1c1f77aa8
diff --git a/session7 b/session7
index f846e2f..13ab6e3 160000
--- a/session7
+++ b/session7
@@ -1 +1 @@
-Subproject commit f846e2f1ab0b40bdc1acc1dbd402763726ff4036
+Subproject commit 13ab6e32d3a02392b664d8e16bf61ceacf282e08
diff --git a/session8 b/session8
index 5643b52..3140f82 160000
--- a/session8
+++ b/session8
@@ -1 +1 @@
-Subproject commit 5643b52089fff22b2621c142f749b23e47736857
+Subproject commit 3140f82d4d7e3662bd8df4c0fa94e19c92c344e6
diff --git a/session9 b/session9
index 317e710..09aed82 160000
--- a/session9
+++ b/session9
@@ -1 +1 @@
-Subproject commit 317e71099d0b087a9e3b2a7013cfc59866a9743e
+Subproject commit 09aed82d3c08d726bec7f78a1f0e6dacb61a8d38