diff --git a/.obsidian/workspace.json b/.obsidian/workspace.json
index 95c130a..c9cf49f 100644
--- a/.obsidian/workspace.json
+++ b/.obsidian/workspace.json
@@ -13,7 +13,7 @@
             "state": {
               "type": "markdown",
               "state": {
-                "file": "UNB/Year 5/Semester 2/CS4745/Lecture Notes.md",
+                "file": "UNB/Year 5/Semester 2/CS4613/Lecture Notes.md",
                 "mode": "source",
                 "source": false
               },
@@ -165,11 +165,13 @@
       "obsidian-git:Open Git source control": false
     }
   },
-  "active": "46a6eee907728856",
+  "active": "a4868a0d0ec2cb3a",
   "lastOpenFiles": [
+    "UNB/Year 5/Semester 2/CS4745/Lecture Notes.md",
+    "UNB/Year 5/Semester 2/CS4613/Lecture Notes.md",
+    "UNB/Year 5/Semester 2/CS4613",
     "UNB/Year 5/Semester 2/CS4745",
     "UNB/Year 5/Semester 2/HIST3925/Lecture Notes.md",
-    "UNB/Year 5/Semester 2/CS4745/Lecture Notes.md",
     "UNB/Year 5/Semester 2/HIST3925",
     "UNB/Year 5/Semester 2/CS3383/Lecture Notes.md",
     "UNB/Year 5/Semester 2/CS3383",
@@ -191,8 +193,6 @@
     "UNB/Year 5/Semester 1/HIST1451/Political questionaire.md",
     "UNB/Year 5/Semester 1/CS3113",
     "UNB/Year 5/Semester 1/HIST1001",
-    "UNB/Year 5/Semester 1/HIST1451",
-    "UNB/Year 5/Semester 1",
-    "UNB/Year 5"
+    "UNB/Year 5/Semester 1/HIST1451"
   ]
 }
\ No newline at end of file
diff --git a/UNB/Year 5/Semester 2/CS4613/Lecture Notes.md b/UNB/Year 5/Semester 2/CS4613/Lecture Notes.md
new file mode 100644
index 0000000..09b76bc
--- /dev/null
+++ b/UNB/Year 5/Semester 2/CS4613/Lecture Notes.md	
@@ -0,0 +1,5 @@
+TODO: Go over slide 1 stuff and fill in
+
+# Lecture 2
+## S-Expressions
+### Simplified Calculator Parser