diff --git a/preamble.tex b/preamble.tex
index d57ad1d..af7d68e 100644
--- a/preamble.tex
+++ b/preamble.tex
@@ -5,6 +5,7 @@
 
 \usepackage[tmargin=2cm,rmargin=1in,lmargin=1in,margin=0.85in,bmargin=2cm,footskip=.2in]{geometry}
 \usepackage{amsmath,amsfonts,amsthm,amssymb,mathtools}
+\usepackage{listings}
 \usepackage[varbb]{newpxmath}
 \usepackage{xfrac}
 \usepackage[makeroom]{cancel}
@@ -192,7 +193,7 @@
 %================================
 
 \tcbuselibrary{theorems,skins,hooks}
-\newtcbtheorem[number within=section]{Lenma}{Lenma}
+\newtcbtheorem[number within=section]{Review}{Review}
 {%
 	enhanced,
 	breakable,
@@ -212,7 +213,7 @@
 {th}
 
 \tcbuselibrary{theorems,skins,hooks}
-\newtcbtheorem[number within=chapter]{lenma}{Lenma}
+\newtcbtheorem[number within=chapter]{review}{Review}
 {%
 	enhanced,
 	breakable,
@@ -233,11 +234,11 @@
 
 
 %================================
-% PROPOSITION
+% METHOD
 %================================
 
 \tcbuselibrary{theorems,skins,hooks}
-\newtcbtheorem[number within=section]{Prop}{Proposition}
+\newtcbtheorem[number within=section]{Method}{Method}
 {%
 	enhanced,
 	breakable,
@@ -257,7 +258,7 @@
 {th}
 
 \tcbuselibrary{theorems,skins,hooks}
-\newtcbtheorem[number within=chapter]{prop}{Proposition}
+\newtcbtheorem[number within=chapter]{method}{Method}
 {%
 	enhanced,
 	breakable,
@@ -554,7 +555,7 @@
 	colframe=gray!80!black,
 	size=small,
 	boxrule=1pt,
-	title=\textbf{Note:-},
+	title=\textbf{Note:},
 	halign title=flush center,
 	coltitle=black,
 	breakable,
@@ -589,8 +590,8 @@
 
 \newcommand{\thm}[2]{\begin{Theorem}{#1}{}#2\end{Theorem}}
 \newcommand{\cor}[2]{\begin{Corollary}{#1}{}#2\end{Corollary}}
-\newcommand{\mlenma}[2]{\begin{Lenma}{#1}{}#2\end{Lenma}}
-\newcommand{\mprop}[2]{\begin{Prop}{#1}{}#2\end{Prop}}
+\newcommand{\rvw}[2]{\begin{Review}{#1}{}#2\end{Review}}
+\newcommand{\mthd}[2]{\begin{Method}{#1}{}#2\end{Method}}
 \newcommand{\clm}[3]{\begin{claim}{#1}{#2}#3\end{claim}}
 \newcommand{\wc}[2]{\begin{wconc}{#1}{}\setlength{\parindent}{1cm}#2\end{wconc}}
 \newcommand{\thmcon}[1]{\begin{Theoremcon}{#1}\end{Theoremcon}}