diff --git a/f22/meena_lec_notes/lec-04/lec_04_Vars_and_Exprs.ipynb b/f22/meena_lec_notes/lec-04/lec_04_Vars_and_Exprs.ipynb
index 85f4926980d7970da10e8fe3b888bb1d53684053..3cd4d253b436b0d60b4fe4567c4be9daddc07ae4 100644
--- a/f22/meena_lec_notes/lec-04/lec_04_Vars_and_Exprs.ipynb
+++ b/f22/meena_lec_notes/lec-04/lec_04_Vars_and_Exprs.ipynb
@@ -1,7 +1,6 @@
 {
  "cells": [
   {
-   "attachments": {},
    "cell_type": "markdown",
    "metadata": {},
    "source": [
@@ -38,7 +37,7 @@
     "\n",
     "# Correct order for operator precedence\n",
     "# 1. exponents: **\n",
-    "# 2. add/subtract: +, -\n",
+    "# 2. signs: +x, -x\n",
     "# 3. multiply/divide: *, /, //, %\n",
     "# 4. add/subtract: +, -\n",
     "# 5. comparison:  ==, !=, <, <=, >, >=\n",
@@ -342,7 +341,6 @@
    ]
   },
   {
-   "attachments": {},
    "cell_type": "markdown",
    "metadata": {},
    "source": [
@@ -364,7 +362,6 @@
    ]
   },
   {
-   "attachments": {},
    "cell_type": "markdown",
    "metadata": {},
    "source": [
@@ -543,7 +540,6 @@
    ]
   },
   {
-   "attachments": {},
    "cell_type": "markdown",
    "metadata": {},
    "source": [
@@ -889,13 +885,6 @@
     "valid = 0 <= age <= 100\n",
     "print(\"you may continue: \" + str(valid))"
    ]
-  },
-  {
-   "cell_type": "code",
-   "execution_count": null,
-   "metadata": {},
-   "outputs": [],
-   "source": []
   }
  ],
  "metadata": {