diff --git a/src/Warm-Ups/What's an AST/main.tex b/src/Warm-Ups/What's an AST/main.tex
deleted file mode 100755
index 39dd677..0000000
--- a/src/Warm-Ups/What's an AST/main.tex	
+++ /dev/null
@@ -1,43 +0,0 @@
-\documentclass[
-	solutions,
-	hidewarning,
-	singlenumbering,
-	nopagenumber
-]{../../../lib/tex/ormc_handout}
-\usepackage{../../../lib/tex/macros}
-
-
-\usepackage[linguistics]{forest}
-
-
-
-\title{Warm-Up: What's an AST?}
-\uptitler{\smallurl{}}
-\subtitle{Prepared by Mark on \today. \\ Based on a true story.}
-
-\begin{document}
-
-	\maketitle
-
-	Say you have a valid string of simple arithmetic that contains no unary operators (like $3!$ or $-4$) and no parenthesis:
-	$$
-	3 + 9 \times 8 \div 5 \land 6
-	$$
-
-	You may assume that all numbers and operators in this string consist of exactly one character. \\
-
-	Devise an algorithm that turns this string into a tree (as shown below), respecting the order of operations $[\land, \times, \div, +, -]$.
-
-	\begin{center}
-	\begin{forest}
-		[$+$
-			[3]
-			[$\div$
-				[$\times$[9][8]]
-				[$\land$[5][6]]
-			]
-		]
-	\end{forest}
-	\end{center}
-
-\end{document}
\ No newline at end of file
diff --git a/src/Warm-Ups/What's an AST/main.typ b/src/Warm-Ups/What's an AST/main.typ
new file mode 100644
index 0000000..6c32b92
--- /dev/null
+++ b/src/Warm-Ups/What's an AST/main.typ	
@@ -0,0 +1,74 @@
+#import "@local/handout:0.1.0": *
+#import "@preview/cetz:0.3.1"
+
+#show: handout.with(
+  title: [Warm-Up: What's an AST?],
+  by: "Mark",
+  subtitle: "Based on a true story.",
+)
+
+#problem()
+Say we have a valid string of simple arithmetic that contains \
+no unary operators (like $3!$ or $-4$) and no parenthesis:
+
+#v(2mm)
+$
+  3 + 9 times 8 div 5 and 6
+$
+#v(2mm)
+
+You may assume that all numbers and operators in this string consist of exactly one character. \
+
+Devise an algorithm that turns such strings into a tree (as shown below), \
+respecting the order of operations $[and, times, div, +, -]$.
+
+#v(2mm)
+
+#align(
+  center,
+  cetz.canvas({
+    import cetz.draw: *
+
+    // spell:off
+    content((0, 0), $+$, name: "r")
+    content((-0.5, -1), $3$, name: "a")
+    content((0.5, -1), $div$, name: "b")
+    content((-0.3, -2), $times$, name: "ba")
+    content((1.3, -2), $and$, name: "bb")
+    content((-0.8, -3), $9$, name: "baa")
+    content((0.2, -3), $8$, name: "bab")
+    content((0.8, -3), $5$, name: "bba")
+    content((1.8, -3), $6$, name: "bbb")
+    // spell:on
+
+    // Zero-sized arrows are a hack for offset.
+    set-style(
+      stroke: (thickness: 0.3mm),
+      mark: (
+        start: (
+          symbol: "|",
+          offset: 0.25,
+          width: 0mm,
+          length: 0mm,
+        ),
+        end: (
+          symbol: "|",
+          offset: 0.25,
+          width: 0mm,
+          length: 0mm,
+        ),
+      ),
+    )
+
+    // spell:off
+    line("r", "a")
+    line("r", "b")
+    line("b", "ba")
+    line("b", "bb")
+    line("ba", "baa")
+    line("ba", "bab")
+    line("bb", "bba")
+    line("bb", "bbb")
+    // spell:on
+  }),
+)