diff --git a/slides/BLcourse2.1.pdf b/slides/BLcourse2.1.pdf
index cff6718b8c77ba1c64c35cf5deeebb44089596a8..72a2bc0774c0869b26970ec93a0f1e993f28d587 100644
Binary files a/slides/BLcourse2.1.pdf and b/slides/BLcourse2.1.pdf differ