Use TikZ

preamble.tex

@@ -117,4 +117,12 @@ morekeywords=[2]{bool,i8,i16,i32,i64,i128,isize,u8,u16,u32,u64,u128,usize,f32,f6
 %%%
 \usepackage{mathtools}
 \usepackage{amssymb}
-\usepackage{unicode-math}
\ No newline at end of file
+\usepackage{unicode-math}
+
+%%%
+% Graphics
+%%%
+\usepackage{tikz}
+\usetikzlibrary{shapes.geometric}
+\usetikzlibrary{shapes.misc}
+\usetikzlibrary{arrows}