diff --git a/galton.pdf b/galton.pdf index 6ff02c4..1f78a62 100644 Binary files a/galton.pdf and b/galton.pdf differ diff --git a/material/ab1.pdf b/material/ab1.pdf index 3064f33..2927506 100644 Binary files a/material/ab1.pdf and b/material/ab1.pdf differ