Minor cleanup

Misc/Warm-Ups/ast.tex

@@ -13,6 +13,7 @@
 		{Warm-Up: What's an AST?}
 		{Prepared by Mark on \today. \\ Based on a true story.}
 
+	\vspace{2mm}
 
 	Say you have a valid string of simple arithmetic that contains no unary operators (like $3!$ or $-4$) and no parenthesis:
 	$$

Misc/Warm-Ups/electician.tex

@@ -1,5 +1,3 @@
-% use [nosolutions] flag to hide solutions.
-% use [solutions] flag to show solutions.
 \documentclass[
 	solutions,
 	nowarning,
@@ -28,6 +26,8 @@
 		{The Electrician's Warm-Up}
 		{Prepared by Mark on \today}
 
+	\vspace{2mm}
+
 	Ivan the electician is working in an apartment. He has a box of switches, which come in three types:
 	\begin{center}
 		\begin{minipage}[t]{0.3\textwidth}

Misc/Warm-Ups/raid.tex

@@ -1,5 +1,3 @@
-% use [nosolutions] flag to hide solutions.
-% use [solutions] flag to show solutions.
 \documentclass[
 	solutions,
 	nowarning,
@@ -15,6 +13,7 @@
 		{The Sysadmin's Warm-Up}
 		{Prepared by Mark on \today}
 
+	\vspace{2mm}
 
 	Most of you have seen a hard drive. Many have touched one, and a lucky few have poked around inside one. These devices have two interesting properties:
 

Misc/Warm-Ups/regex.tex

@@ -1,5 +1,3 @@
-% use [nosolutions] flag to hide solutions.
-% use [solutions] flag to show solutions.
 \documentclass[
 	solutions,
 	nowarning
@@ -19,6 +17,8 @@
 		{The Regex Warm-Up}
 		{Prepared by Mark on \today}
 
+	\vspace{2mm}
+
 	Last time, we discussed Deterministic Finite Automata. One interesting application of these mathematical objects is found in computer science: Regular Expressions. \\
 	(abbreviated \say{regex}, which is pronounced like \say{gif})