diff --git a/.gitmodules b/.gitmodules
index 019e9dc..e21cf96 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -1,6 +1,3 @@
-[submodule "paip"]
-	path = paip/book
-	url = https://github.com/norvig/paip-lisp.git
 [submodule "paip/book"]
 	path = paip/book
-	url = https://github.com/norvig/paip-lisp
+	url = https://github.com/norvig/paip-lisp.git
diff --git a/12/QG-2014/QG-2014.pdf b/12/QG-2014/QG-2014.pdf
old mode 100755
new mode 100644
diff --git a/12/TP-HN-2009/R1/R1.pdf b/12/TP-HN-2009/R1/R1.pdf
old mode 100755
new mode 100644
diff --git a/12/TP-HN-2009/R2/R2.pdf b/12/TP-HN-2009/R2/R2.pdf
old mode 100755
new mode 100644
diff --git a/paip/book b/paip/book
index 40bcebd..190a5c3 160000
--- a/paip/book
+++ b/paip/book
@@ -1 +1 @@
-Subproject commit 40bcebdaeccf7ce5c4fa13ef20ffe0cd10a66dff
+Subproject commit 190a5c33aea5591698686c1db5fe44b0619e1b94