diff --git a/gen/missing_semester_2020/.gitignore b/gen/missing_semester_2020/.gitignore
deleted file mode 100644
index 3917bca..0000000
--- a/gen/missing_semester_2020/.gitignore
+++ /dev/null
@@ -1,107 +0,0 @@
-# Created by https://www.toptal.com/developers/gitignore/api/vim,emacs,osx
-# Edit at https://www.toptal.com/developers/gitignore?templates=vim,emacs,osx
-
-*.html
-*.css
-*.css.map
-
-### Emacs ###
-# -*- mode: gitignore; -*-
-*~
-\#*\#
-/.emacs.desktop
-/.emacs.desktop.lock
-*.elc
-auto-save-list
-tramp
-.\#*
-
-# Org-mode
-.org-id-locations
-*_archive
-
-# flymake-mode
-*_flymake.*
-
-# eshell files
-/eshell/history
-/eshell/lastdir
-
-# elpa packages
-/elpa/
-
-# reftex files
-*.rel
-
-# AUCTeX auto folder
-/auto/
-
-# cask packages
-.cask/
-dist/
-
-# Flycheck
-flycheck_*.el
-
-# server auth directory
-/server/
-
-# projectiles files
-.projectile
-
-# directory configuration
-.dir-locals.el
-
-# network security
-/network-security.data
-
-
-### OSX ###
-# General
-.DS_Store
-.AppleDouble
-.LSOverride
-
-# Icon must end with two \r
-Icon
-
-# Thumbnails
-._*
-
-# Files that might appear in the root of a volume
-.DocumentRevisions-V100
-.fseventsd
-.Spotlight-V100
-.TemporaryItems
-.Trashes
-.VolumeIcon.icns
-.com.apple.timemachine.donotpresent
-
-# Directories potentially created on remote AFP share
-.AppleDB
-.AppleDesktop
-Network Trash Folder
-Temporary Items
-.apdisk
-
-### Vim ###
-# Swap
-[._]*.s[a-v][a-z]
-!*.svg # comment out if you don't need vector files
-[._]*.sw[a-p]
-[._]s[a-rt-v][a-z]
-[._]ss[a-gi-z]
-[._]sw[a-p]
-
-# Session
-Session.vim
-Sessionx.vim
-
-# Temporary
-.netrwhist
-# Auto-generated tag files
-tags
-# Persistent undo
-[._]*.un~
-
-# End of https://www.toptal.com/developers/gitignore/api/vim,emacs,osx
diff --git a/gen/missing_semester_2020/.gitmodules b/gen/missing_semester_2020/.gitmodules
deleted file mode 100644
index 86216b7..0000000
--- a/gen/missing_semester_2020/.gitmodules
+++ /dev/null
@@ -1,3 +0,0 @@
-[submodule "_share/media/sass/org-media-sass"]
- path = _share/media/sass/org-media-sass
- url = git@bitbucket.org:ronnyabraham/org-media-sass.git
diff --git a/gen/missing_semester_2020/_share/media/fonts b/gen/missing_semester_2020/_share/media/fonts
deleted file mode 120000
index 6f076aa..0000000
--- a/gen/missing_semester_2020/_share/media/fonts
+++ /dev/null
@@ -1 +0,0 @@
-/Users/ronny/notes/_share/media/fonts
\ No newline at end of file
diff --git a/gen/missing_semester_2020/_share/media/img/lecture01/ex01.png b/gen/missing_semester_2020/_share/media/img/lecture01/ex01.png
deleted file mode 100644
index 26cdbcf..0000000
Binary files a/gen/missing_semester_2020/_share/media/img/lecture01/ex01.png and /dev/null differ
diff --git a/gen/missing_semester_2020/_share/media/js/collapsible.js b/gen/missing_semester_2020/_share/media/js/collapsible.js
deleted file mode 120000
index c7c8b09..0000000
--- a/gen/missing_semester_2020/_share/media/js/collapsible.js
+++ /dev/null
@@ -1 +0,0 @@
-/Users/ronny/notes/_share/media/js/collapsible.js
\ No newline at end of file
diff --git a/gen/missing_semester_2020/_share/media/sass/missing-semester.sass b/gen/missing_semester_2020/_share/media/sass/missing-semester.sass
deleted file mode 100644
index fc4fd80..0000000
--- a/gen/missing_semester_2020/_share/media/sass/missing-semester.sass
+++ /dev/null
@@ -1,93 +0,0 @@
-@use "sass:map"
-@use "sass:color"
-
-@use 'org-media-sass/default-org-mode'
-
-@use 'org-media-sass/themes/desert-oasis' as *
-@use 'org-media-sass/fonts' as fonts
-@use 'org-media-sass/mixins' as mixins-basic
-
-@include mixins-basic.set-header-sizes($default-header-sizes)
-@include mixins-basic.set-header-colors($default-header-colors)
-@include mixins-basic.set-header-margins-sides($default-header-margins-sides)
-@include mixins-basic.set-header-margins-vertical($default-header-margins-vertical)
-
-
-/* Base Styles */
-body
- font-family: $primary-font
- color: $text-color
- background-color: $background-color
-
-/* Link Styles */
-a
- color: $anchor-color
-
- &:hover
- color: $anchor-hover-color
-
-// Lists
-ul, ol
- padding-left: $list-padding-left
-
-// Blockquotes
-blockquote
- border-color: $secondary-color
- color: color.adjust($text-color, $lightness: 10%)
- font-family: $secondary-font
-
-// Tables
-table
- color: $text-color
-
-th, td
- border-color: $table-border-color
-
-th
- background-color: $table-header-bg
- color: $text-color
-
-tr:nth-child(even)
- background-color: color.adjust($background-color, $lightness: 5%)
-
-/* Code Block Styles */
-pre, code
- background-color: $code-background-color
- color: $code-text-color
-
- font-family: $secondary-font
-
-/* Header Styles */
-h1, h2, h3, h4, h5, h6
- font-family: $secondary-font
-
-h4[id="timestamp"]
- text-transform: uppercase
- color: color.adjust(map.get($default-header-colors, 'h3'), $lightness: 10%)
-
-h4[id="playlist"]
- color: color.adjust(map.get($default-header-colors, 'h3'), $lightness: -10%)
-h3
- a
- color: color.adjust($anchor-color, $lightness: -12%)
- &:hover
- color: color.adjust($anchor-hover-color, $lightness: -12%)
-
-// Notes
-.note
- background-color: $note-background-color
- border-color: $note-border-color
- color: $text-color
-
-div#postamble
- border-color: $note-border-color
- color: color.adjust($note-border-color, $lightness: 20%)
-
-/* Table of Contents Link */
-.toc
- color: $primary-color
-
-div#table-of-contents ul li a
- color: $toc-anchor-color
- &:hover
- color: $toc-anchor-hover-color
diff --git a/gen/missing_semester_2020/_subsections/lesson-01.org b/gen/missing_semester_2020/_subsections/lesson-01.org
deleted file mode 100644
index 4640115..0000000
--- a/gen/missing_semester_2020/_subsections/lesson-01.org
+++ /dev/null
@@ -1,133 +0,0 @@
-#+title: Lesson 01 | Course Overview + Shell
-#+HTML_HEAD:
-#+HTML_HEAD:
-#+HTML_HEAD:
-
-* Links
-#+attr_html: :class links
-- [[../toc.org][TOC | Missing Semester]]
-- [[https://www.youtube.com/playlist?list=PLyzOVJj3bHQuloKGG59rS43e29ro7I57J][Playlist: Missing Semester]]
-
-*** timestamps
-:PROPERTIES:
-:CUSTOM_ID: timestamp
-:END:
-
-#+attr_html: :class playlist
-- [[https://www.youtube.com/watch?v=Z56Jmr9Z34Q&list=PLyzOVJj3bHQuloKGG59rS43e29ro7I57J&t=20s][00:20 why we're doing this class]]
-- [[https://www.youtube.com/watch?v=Z56Jmr9Z34Q&list=PLyzOVJj3bHQuloKGG59rS43e29ro7I57J&t=251s][04:11 the shell]]
-- [[https://www.youtube.com/watch?v=Z56Jmr9Z34Q&list=PLyzOVJj3bHQuloKGG59rS43e29ro7I57J&t=338s][05:38 install a terminal and a shell]]
-- [[https://www.youtube.com/watch?v=Z56Jmr9Z34Q&list=PLyzOVJj3bHQuloKGG59rS43e29ro7I57J&t=364s][06:05 the shell prompt]]
-- [[https://www.youtube.com/watch?v=Z56Jmr9Z34Q&list=PLyzOVJj3bHQuloKGG59rS43e29ro7I57J&t=411s][06:51 shell prompt]]
-- [[https://www.youtube.com/watch?v=Z56Jmr9Z34Q&list=PLyzOVJj3bHQuloKGG59rS43e29ro7I57J&t=522s][08:42 how does the shell know what these programs are]]
-- [[https://www.youtube.com/watch?v=Z56Jmr9Z34Q&list=PLyzOVJj3bHQuloKGG59rS43e29ro7I57J&t=672s][11:12 paths]]
-- [[https://www.youtube.com/watch?v=Z56Jmr9Z34Q&list=PLyzOVJj3bHQuloKGG59rS43e29ro7I57J&t=738s][12:18 absolute path]]
-- [[https://www.youtube.com/watch?v=Z56Jmr9Z34Q&list=PLyzOVJj3bHQuloKGG59rS43e29ro7I57J&t=759s][12:39 relative paths]]
-- [[https://www.youtube.com/watch?v=Z56Jmr9Z34Q&list=PLyzOVJj3bHQuloKGG59rS43e29ro7I57J&t=1034s][17:14 tilde character]]
-- [[https://www.youtube.com/watch?v=Z56Jmr9Z34Q&list=PLyzOVJj3bHQuloKGG59rS43e29ro7I57J&t=1336s][22:16 directories]]
-- [[https://www.youtube.com/watch?v=Z56Jmr9Z34Q&list=PLyzOVJj3bHQuloKGG59rS43e29ro7I57J&t=1376s][22:56 execute on directories]]
-- [[https://www.youtube.com/watch?v=Z56Jmr9Z34Q&list=PLyzOVJj3bHQuloKGG59rS43e29ro7I57J&t=1514s][25:14 cp command]]
-- [[https://www.youtube.com/watch?v=Z56Jmr9Z34Q&list=PLyzOVJj3bHQuloKGG59rS43e29ro7I57J&t=1547s][25:47 rm]]
-- [[https://www.youtube.com/watch?v=Z56Jmr9Z34Q&list=PLyzOVJj3bHQuloKGG59rS43e29ro7I57J&t=1590s][26:30 create a new directory]]
-- [[https://www.youtube.com/watch?v=Z56Jmr9Z34Q&list=PLyzOVJj3bHQuloKGG59rS43e29ro7I57J&t=1912s][31:52 pipe character]]
-- [[https://www.youtube.com/watch?v=Z56Jmr9Z34Q&list=PLyzOVJj3bHQuloKGG59rS43e29ro7I57J&t=2044s][34:04 grep]]
-- [[https://www.youtube.com/watch?v=Z56Jmr9Z34Q&list=PLyzOVJj3bHQuloKGG59rS43e29ro7I57J&t=2145s][35:45 the root user]]
-- [[https://www.youtube.com/watch?v=Z56Jmr9Z34Q&list=PLyzOVJj3bHQuloKGG59rS43e29ro7I57J&t=2239s][37:19 kernel paramters]]
-- [[https://www.youtube.com/watch?v=Z56Jmr9Z34Q&list=PLyzOVJj3bHQuloKGG59rS43e29ro7I57J&t=2612s][43:32 scroll lock led]]
-- [[https://www.youtube.com/watch?v=Z56Jmr9Z34Q&list=PLyzOVJj3bHQuloKGG59rS43e29ro7I57J&t=2706s][45:06 open a file]]
-- [[https://www.youtube.com/watch?v=Z56Jmr9Z34Q&list=PLyzOVJj3bHQuloKGG59rS43e29ro7I57J&t=2829s][47:09 lecture notes]]
-- [[https://www.youtube.com/watch?v=Z56Jmr9Z34Q&list=PLyzOVJj3bHQuloKGG59rS43e29ro7I57J&t=2875s][office hours]]
-
-* Notes
-** why
-- there are many tools that make life easier for programmers
-- lecture notes and recordings are available online
-
-** the shell
-- programs are meant to be integrates with each other through the shell
-- most common shell is Bourne Again Shell (bash)
-
-** shell prompt
-- typical shell prompt:
- #+attr_html: :width 300px
- file:../_share/media/img/lecture01/ex01.png
-
-- shells can be customized extensibly
-- arguments are seperated by whitespace
-- multiple words can be passed as a single argument via:
- - quotes
- #+begin_src bash
- echo "Hello world"
- #+end_src
-
- - escapes
- #+begin_src bash
- echo Hello\ world
- #+end_src
-
-** how does the shell know where programs are
-- via environment variable
- - things that are set whenever you start your shell
- - where is your home directory
- - what is your username
- - what are the PATHs to your programs
-- shells, and bash in particular, are programming languages
-
-** paths
-*** PATH environment variable
-
-- a list seperated by colons (:)
-- when bash is asked to run a program bash will search through the directories in path until it finds the program
-
-*** absolute vs relative path
-
-- pwd: print working directory
-- all relative paths are relative to your current working directory
-- absolute path starts with '/'
-
-*** special directories
-- '.' current directory
-- '..' parent directory
-
-*** tilde (~)
-- always expands to your home directory
-
-*** dash (-)
-- toggles to the previous directory you were at
-
- #+begin_src bash
- cd /home/ronny/programs/notes/courses
- cd ../../
- cd -
- pwd
- #+end_src
-
-the output will be
-=/home/ronny/programs/notes/courses=
-
-** permissions
-*** groups of three
-- read
-- write
-- execute
-
-*** directories
-- read: are you allowed to see the files
-- write: can you rename the files in the directory
-- execute: "search" are you allowed to enter this directory
- - to access a file in a directory, you need execute permissions on all directories in the path
-
-** piping
-- every program has two streams
- - input stream
- - output stream
-- shell allows you to change streams
- - angle brackets
- - left angle < : rewire input
- - right angle > : rewire output
-
-- example
- #+begin_src bash
- echo hello > hello.txt
- cat < hello.txt
- #+end_src
diff --git a/gen/missing_semester_2020/_subsections/lesson-02.org b/gen/missing_semester_2020/_subsections/lesson-02.org
deleted file mode 100644
index 7c48d92..0000000
--- a/gen/missing_semester_2020/_subsections/lesson-02.org
+++ /dev/null
@@ -1,288 +0,0 @@
-#+title: lesson 02 | course overview + the shell
-#+HTML_HEAD:
-#+HTML_HEAD:
-#+HTML_HEAD:
-
-* Links
-#+attr_html: :class links
-- [[../toc.org][TOC | Missing Semester]]
-- [[https://www.youtube.com/playlist?list=PLyzOVJj3bHQuloKGG59rS43e29ro7I57J][Playlist: Missing Semester]]
-
-- Curr: https://youtu.be/kgII-YWo3Zw?si=Wm8KLT1ggOGG8W-g&t=1692
-
-
-*** timestamps
-:PROPERTIES:
-:CUSTOM_ID: timestamp
-:END:
-
-#+attr_html: :class playlist
-+ [[https://www.youtube.com/watch?v=kgII-YWo3Zw&t=54s][00:54 - control flow functions]]
-+ [[https://www.youtube.com/watch?v=kgII-YWo3Zw&t=227s][03:47 - sequential execution]]
-+ [[https://www.youtube.com/watch?v=kgII-YWo3Zw&t=425s][07:05 - standard input]]
-+ [[https://www.youtube.com/watch?v=kgII-YWo3Zw&t=444s][07:24 - error code]]
-+ [[https://www.youtube.com/watch?v=kgII-YWo3Zw&t=517s][08:37 - logical operators]]
-+ [[https://www.youtube.com/watch?v=kgII-YWo3Zw&t=603s][10:03 - concatenate commands]]
-+ [[https://www.youtube.com/watch?v=kgII-YWo3Zw&t=645s][10:45 - common substitution]]
-+ [[https://www.youtube.com/watch?v=kgII-YWo3Zw&t=675s][11:15 - process substitution]]
-+ [[https://www.youtube.com/watch?v=kgII-YWo3Zw&t=935s][15:35 - comparison operator]]
-+ [[https://www.youtube.com/watch?v=kgII-YWo3Zw&t=1173s][19:33 - curly braces]]
-+ [[https://www.youtube.com/watch?v=kgII-YWo3Zw&t=1359s][22:39 - python script]]
-+ [[https://www.youtube.com/watch?v=kgII-YWo3Zw&t=1707s][28:27 - man command]]
-+ [[https://www.youtube.com/watch?v=kgII-YWo3Zw&t=2175s][31:26 - finding files]] *current*
-+ [[https://www.youtube.com/watch?v=kgII-YWo3Zw&t=2190s][36:30 - grep]]
-+ [[https://www.youtube.com/watch?v=kgII-YWo3Zw&t=2573s][42:53 - fuzzy finder]]
-+ [[https://www.youtube.com/watch?v=kgII-YWo3Zw&t=2649s][44:09 - history substring search]]
-
-* Notes
-
-** bash
-*** spaces are critical with bash
- - this works:
- #+begin_src bash
- foo=bar
- echo $foo
- #+end_src
-
- - this doesn't:
- #+begin_src bash
- foo = bar
- echo $foo
- #+end_src
-
- - the output of that will be
- =zsh: command not found: foo=
-
- - what happens in the above example is that we are effectively calling the "foo" program with the arguments: "=" and "bar"
-
-*** quotes
-- you can use double or single quotes to print a value
- #+begin_src bash
- echo "Hello"
- #+end_src
- #+begin_src bash
- echo 'Hello'
- #+end_src
-
-- double quotes can interpolate variables
- #+begin_src bash
- echo "Value is $foo"
- #+end_src
-
- will return: =Value is bar=
-
-- single quotes can NOT interpoloate variables
- #+begin_src bash
- echo 'Value is $foo'
- #+end_src
-
- will return: =Value is $foo=
-
-** sequential execution
-
-*** bash functions
-- mcd.sh
-#+begin_src bash
-mcd() {
- mkdir -p "$1"
- cd "$1"
- }
-#+end_src bash
-
-- creates a function that can be executed after loading
- - $1 is a global variable referring to the first parameter
-
-*** source
-- using source mcd.sh
- =source mcd.sh=
-
-- then carry out the function
- =mcd testdir=
-
-- this will create a new directory and cd into it as per the definied functioned
-
-** error codes
-*** commands to access codes or values
-- $0 -- name of the script we are currently in
- - if you run this in the shell it will display 'bash'
-- $1->$9 -- the first through ninth argument given to a script
-- $? -- the last error message
-- $_ --- last argument of the previous call
-
-- !! -- recreates the last call with it's arguments
- - use with sudo if you found your call needed a sudo and you don't feel like retyping it again
-
- #+begin_src bash
- ls -lah
- sudo !!
- #+end_src
-
-*** code values
-- boolean
- - true returns an error code of 0
- - false returns an error code of 1
-
-** using $@ and $*
-- represents all the arguments passed to a script or a function as separate, individual strings. It preserves each argument as a distinct item, even if the argument contains spaces.
-
-*** key points about $@
-1. All Arguments: It refers to all the command-line arguments passed to the script.
-2. Preserves Spaces: If an argument contains spaces, it is treated as a single argument.
-3. Usage: It is commonly used in a loop to iterate over each argument.
-
-*** example
-#+begin_src bash
-./myscript.sh file1.txt "file with spaces.txt" file3.txt
-#+end_src
-
-then $@ will be
-=file1.txt "file with spaces.txt" file3.txt=
-
-*** differences between $*
-- *$@* treats each argument as a sepearte item
-- *$** treats all arguments as a single, combined string
-
-
-** logical operators
-- you can use the error return value in conditionals
-*** example using the OR conditional
- #+begin_src bash
- false || echo "Oops fail"
- "Oops fail"
- #+end_src
-
-*** example using the AND conditional
- #+begin_src bash
- true && echo "this will print"
- "this will print"
- #+end_src
-
-** concatenate commands
-- you caoncatinate commands using the semicolon: *;*
-
- #+begin_src bash
- false; echo "this prints always"
- "this prints always"
- #+end_src
-
-** common substitution
-- take the output of a command and put it in a variable
- #+begin_src bash
- foo=$(pwd)
- echo $foo
- "/Users/ronny/..."
- #+end_src
-
-- this can also be done by placing that format in a string and it will expand the string
- #+begin_src bash
- echo "the pwd output is: $(pwd)"
- "the pwd output is: /Users/ronny/..."
- #+end_src
-
-** process substitution
-*** description
-Bash process substitution is a feature that allows you to use the output of a command or a process as if it were a file. It enables you to redirect input or output between processes in a flexible way without needing intermediate temporary files.
-
-*** Syntax
-- creates a temporary file descriptor for the output of the command, which can be used as an input file in another command.
- #+begin_src bash
- <(command)
- #+end_src
-- creates a temporary file descriptor for writing to the command, which can be used as an output file in another command.
- #+begin_src bash
- >(command)
- #+end_src
-
-*** examples
-- this will take b, a, d, c and sort it so the result is 'a, b, c, d'
- #+begin_src bash
- sort <(echo -e "b\na") <(echo -e "d\nc")
- #+end_src
-
-- this will list the files, send the list to *tee* which will split a portion off to the screen and the rest to grep, followed by text_files.txt
-
- #+begin_src bash
- ls | tee >(grep "txt" > text_files.txt)
- #+end_src
-
-#+begin_src bash
-echo "Starting program at $(date)" # Date will be substituted
-echo "Running program $0 with $# arguments with pid $$"
-
-for file in "$@"; do
- grep foobar "$file" > /dev/null 2> /dev/null
-
- # when pattern is not found, grep has exit status 1
- # we redirect STDOUT and STDERR to a null register since we do not care about them
-
- if [[ "$?" - ne 0 ]]; then
- echo "File $file does not have any foober adding one"
- echo "# foobar" >> "$file"
- fi
-done
-#+end_src
-
-- *$$* pid given for program
-- *$#* number of arguments
-- *$@* expands to all the arguments
- - can be used in a for loop
-- *2>* refers to STDERR
-- *>* refers to STDOUT
-
-** test utility
-
-test is a bash utility that you can use to test the condition of a file. look at the man page for more info
-
-** curly braces
-curly braces are used as a form of program command expansion.
-
-the braces contain a number of arguments seperated by commans that will expand into arguments for the program
-
-*** example
-#+begin_src bash
-touch foo{,1,2,10}
-touch foo foo1 foo2 foo10
-
-cp foo{,.old}
-cp foo foo.old
-#+end_src
-
-*** ranges
-this takes the format {1..20}
-
-#+begin_src bash
-touch directory{1..4}/foo{a..z}.txt
-#+end_src
-
-** python scripts
-*** making them bash executable
-- reference the python compiler at the top of the file
- - do it directly:
- #+begin_src bash
- #!/usr/local/bin/python
- #+end_src
- - use the env program to do so
- #+begin_src bash
- #!/usr/bin/env python
- #+end_src
-
-*** args can be found through sys.argv[1:]
- #+begin_src python
-import sys
-for arg in reversed(sys.argv[1:]):
- print(arg)
- #+end_src
-
-** checking for problems in bash scripts using 'shellcheck'
-#+begin_src bash
-shellcheck some_bash_script.sh
-#+end_src
-
-- will tell you problems
-- and warnings
-
-** man command
-- works with both os, and installed tools
-- 'tldr' is easier to read
-
-** find
diff --git a/gen/missing_semester_2020/_subsections/lesson-03.org b/gen/missing_semester_2020/_subsections/lesson-03.org
deleted file mode 100644
index 062c8a1..0000000
--- a/gen/missing_semester_2020/_subsections/lesson-03.org
+++ /dev/null
@@ -1,38 +0,0 @@
-#+title: Lesson 02 | shell tools and scripting
-#+HTML_HEAD:
-#+HTML_HEAD:
-#+HTML_HEAD:
-
-* Links
-#+attr_html: :class links
-- [[../toc.org][TOC | Missing Semester]]
-- [[https://www.youtube.com/playlist?list=PLyzOVJj3bHQuloKGG59rS43e29ro7I57J][Playlist: Missing Semester]]
-
-* Notes
-
-
-*** Playlist
-
-#+attr_html: :class playlist
-1. [[https://www.youtube.com/watch?v=Z56Jmr9Z34Q&list=PLyzOVJj3bHQuloKGG59rS43e29ro7I57J&t=20s][why we're doing this class]]
-2. [[https://www.youtube.com/watch?v=Z56Jmr9Z34Q&list=PLyzOVJj3bHQuloKGG59rS43e29ro7I57J&t=251s][the shell]]
-3. [[https://www.youtube.com/watch?v=Z56Jmr9Z34Q&list=PLyzOVJj3bHQuloKGG59rS43e29ro7I57J&t=338s][install a terminal and a shell]]
-4. [[https://www.youtube.com/watch?v=Z56Jmr9Z34Q&list=PLyzOVJj3bHQuloKGG59rS43e29ro7I57J&t=411s][shell prompt]]
-5. [[https://www.youtube.com/watch?v=Z56Jmr9Z34Q&list=PLyzOVJj3bHQuloKGG59rS43e29ro7I57J&t=522s][how does the shell know what these programs are]]
-6. [[https://www.youtube.com/watch?v=Z56Jmr9Z34Q&list=PLyzOVJj3bHQuloKGG59rS43e29ro7I57J&t=672s][paths]]
-7. [[https://www.youtube.com/watch?v=Z56Jmr9Z34Q&list=PLyzOVJj3bHQuloKGG59rS43e29ro7I57J&t=738s][absolute path]]
-8. [[https://www.youtube.com/watch?v=Z56Jmr9Z34Q&list=PLyzOVJj3bHQuloKGG59rS43e29ro7I57J&t=759s][relative paths]]
-9. [[https://www.youtube.com/watch?v=Z56Jmr9Z34Q&list=PLyzOVJj3bHQuloKGG59rS43e29ro7I57J&t=1034s][tilde character]]
-10. [[https://www.youtube.com/watch?v=Z56Jmr9Z34Q&list=PLyzOVJj3bHQuloKGG59rS43e29ro7I57J&t=1336s][directories]]
-11. [[https://www.youtube.com/watch?v=Z56Jmr9Z34Q&list=PLyzOVJj3bHQuloKGG59rS43e29ro7I57J&t=1376s][execute on directories]]
-12. [[https://www.youtube.com/watch?v=Z56Jmr9Z34Q&list=PLyzOVJj3bHQuloKGG59rS43e29ro7I57J&t=1514s][cp command]]
-13. [[https://www.youtube.com/watch?v=Z56Jmr9Z34Q&list=PLyzOVJj3bHQuloKGG59rS43e29ro7I57J&t=1547s][rm]]
-14. [[https://www.youtube.com/watch?v=Z56Jmr9Z34Q&list=PLyzOVJj3bHQuloKGG59rS43e29ro7I57J&t=1590s][create a new directory]]
-15. [[https://www.youtube.com/watch?v=Z56Jmr9Z34Q&list=PLyzOVJj3bHQuloKGG59rS43e29ro7I57J&t=1912s][pipe character]]
-16. [[https://www.youtube.com/watch?v=Z56Jmr9Z34Q&list=PLyzOVJj3bHQuloKGG59rS43e29ro7I57J&t=2044s][grep]]
-17. [[https://www.youtube.com/watch?v=Z56Jmr9Z34Q&list=PLyzOVJj3bHQuloKGG59rS43e29ro7I57J&t=2145s][the root user]]
-18. [[https://www.youtube.com/watch?v=Z56Jmr9Z34Q&list=PLyzOVJj3bHQuloKGG59rS43e29ro7I57J&t=2239s][kernel paramters]]
-19. [[https://www.youtube.com/watch?v=Z56Jmr9Z34Q&list=PLyzOVJj3bHQuloKGG59rS43e29ro7I57J&t=2612s][scroll lock led]]
-20. [[https://www.youtube.com/watch?v=Z56Jmr9Z34Q&list=PLyzOVJj3bHQuloKGG59rS43e29ro7I57J&t=2706s][open a file]]
-21. [[https://www.youtube.com/watch?v=Z56Jmr9Z34Q&list=PLyzOVJj3bHQuloKGG59rS43e29ro7I57J&t=2829s][lecture notes]]
-22. [[https://www.youtube.com/watch?v=Z56Jmr9Z34Q&list=PLyzOVJj3bHQuloKGG59rS43e29ro7I57J&t=2875s][office hours]]
diff --git a/gen/missing_semester_2020/toc.org b/gen/missing_semester_2020/toc.org
deleted file mode 100644
index 6001773..0000000
--- a/gen/missing_semester_2020/toc.org
+++ /dev/null
@@ -1,34 +0,0 @@
-#+title: Missing Semester IAP 2020
-#+HTML_HEAD:
-#+HTML_HEAD:
-#+HTML_HEAD:
-#+HTML_HEAD:
-
-* Links
-#+attr_html: :class links
-- [[../../../course-listings.org][Courses Listing]]
-- [[https://www.youtube.com/playlist?list=PLyzOVJj3bHQuloKGG59rS43e29ro7I57J][YouTube Playlist: Missing Semester]]
-
-*** playlist
-:PROPERTIES:
-:CUSTOM_ID: playlist
-:END:
-
-#+attr_html: :class playlist
-1. [[https://youtu.be/Z56Jmr9Z34Q?si=XHgfjMWOSx0lSUV8][Lecture 1: Course Overview + The Shell]]
-2. [[https://youtu.be/kgII-YWo3Zw?si=yOa5im_cHzisLeZn][Lecture 2: Shell Tools and Scripting]]
-3. [[https://youtu.be/a6Q8Na575qc?si=7cgWLJfBgtzVvUUC][Lecture 3: Editors]]
-4. [[https://youtu.be/sz_dsktIjt4?si=l9M6_yIDqV1drxNS][Lecture 4: Data Wrangling]]
-5. [[https://youtu.be/e8BO_dYxk5c?si=a6aWoJSVS13rQO1I][Lecture 5: Command-line Environment]]
-6. [[https://youtu.be/2sjqTHE0zok?si=ArLpMvXhrtAsQnLH][Lecture 6: Version Control (git)]]
-7. [[https://youtu.be/l812pUnKxME?si=BDElINPHWLHQzBcD][Lecture 7: Debugging and Profiling]]
-8. [[https://youtu.be/_Ms1Z4xfqv4?si=tMk44R213bG70pCq][Lecture 8: Metaprogramming]]
-9. [[https://youtu.be/tjwobAmnKTo?si=QnIhfVK8mJHCV6PU][Lecture 9: Security and Cryptography]]
-10. [[https://youtu.be/JZDt-PRq0uo?si=7oCytjjvVaGSTDHr][Lecture 10: Potpourri]]
-11. [[https://youtu.be/Wz50FvGG6xU?si=Gmp-YJZm0sR65GAa][Lecture 11: Q&A]]
-
-* Contents Overview
-#+attr_html: :class contents-overview
-- [[./_subsections/lesson-01.org][Lesson 01 | Course Overview + The Shell]]
-- [[./_subsections/lesson-02.org][Lesson 02 | Shell Tools and Scripting]]
-