diff --git a/assets/lectures/.DS_Store b/assets/lectures/.DS_Store
index 8067da2..0ce172d 100644
Binary files a/assets/lectures/.DS_Store and b/assets/lectures/.DS_Store differ
diff --git a/assets/lectures/lecture4/L04_containers_part2.pdf b/assets/lectures/lecture4/L04_containers_part2.pdf
index 527e4f4..527de70 100644
Binary files a/assets/lectures/lecture4/L04_containers_part2.pdf and b/assets/lectures/lecture4/L04_containers_part2.pdf differ