diff --git a/content/203-mobile-app/brainstorming.md b/content/203-mobile-app/brainstorming.md
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-# Main concept
-
-Snowboard trick generator. 
-
-This will be a mobile app that snowboarders can use to automatically generate random tricks. This app will be useful because snowboarders (riders) can get tunnel vision on a certain style of tricks or even a single trick. Using a algorithm to generate tricks provides a way for them to escape this focus. It can also be used when playing a game of SNOW, which is similar to a game of SKATE.
-
-The first core feature of the app is the customisable trick generator. It should be very easy and quick to use. This presents an interesting problem as while snowboarding, users are wearing large mittens, and the air can be very cold for hands. It would be ideal if it could be used while wearing mittens. 
-
-The second core feature of the app is the Daily Trick. However, the issue here is that most people don't snowboard everyday. To get around this, I could allows the users to schedule days on which to recieve a daily trick, or I could alert them whenever they are on a mountain by monitoring their altitude. Of course the second options has some privacy issues that will need to be considered.
-
-**Core features
-- customisable generator
-- daily trick
-	- tricks on a custom schedule
-
-**Extra features
-- track completed tricks
-	- list of tricks not to include
-- links with friends to do same tricks together
-- challenges, where you do a set of tricks over a period of time
-- gesture controls
-- link with coach/teammates
-	- goals
-- gps to detect when you are on a mountain and when to generate a trick
-
-# User Interface Alternatives
-
-
-
-# Existing Apps
-
-- For skateboarding: 
-	- [getatrick.com](https://getatrick.com)
-	- skate gen mobile app
-	- Skate Tricks
-	- Skateboard tricks
-	- Skate Dice
-- Freestyle Generator for inline skating, tramp and skiing
-- Scooter trick generator
-
-[screenshots]()
-
-## Summary
-### Overview
-I was able to find only 7 apps with similar functionality to what I am planning. Of these none 5 were for skateboarding 2 for other sports and zero for snowboarding. 
-### Functionality of the apps
-These 7 apps all had varying degreee of complexity. Some were just simple customizable trick generators, while others were fully fledged coaching and goal tracking apps with community features and other extras. Although I am not planning to make large complicated app, I can still draw from them for guidance as most of them did have a trick generator. 
-
-Aesthetic/style of the apps
-
-
-Conclusion
-
-
-## Skate Dice
-Skate dice was one of the most intresting of the apps I found. I had a very unique approach using a "skate the phone" gesture to "roll" the dice. However it has a paywall for premium features such as more tricks, settings, and a "tricktionary".  From what I was able to use I think is was the most simple and intuitive apps. It also had an aesthetic that fit the culture of the sport. All these features combined made it very enjoyable to use. 
-
-#### How does this app inform mine
-- Keep design simple
-- Maybe incorporate some gestures
-- Consider using an aesthetic wich matches the culture/sport
-
-![100](Screenshot_20220409-192630_Skate%20Dice.jpg)
-
-
-## Skate tricks
-
-This app is a much more fully featured solution. It is oriented towards learning skateboarding, and keeping track of you progress while doing it. It also has a built in trick generator, and game of skate. One of the most unique features it had that the other apps didn't was a trick of the day. This is one of the core features I want to include in my app. Another interesting feature it had was a page informing the user about injury prevention.
-
-#### How Could this app inform mine
-- The injury prevention page could be a very good thing to include
-- 
diff --git a/content/203-mobile-app/hours.md b/content/203-mobile-app/hours.md
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-2022-04-10: 1
diff --git a/content/203-mobile-app/idea.md b/content/203-mobile-app/idea.md
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-1. Snowboard coaching app
-	1. goals
-	2. daily/manual/weekly trick generator
-	3. 
-2. Album of the day generator
-	1. from besteveralbums.com
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diff --git a/content/203-mobile-app/mobile-app-ass-03.md b/content/203-mobile-app/mobile-app-ass-03.md
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----
-title: "mobile-app-ass-03"
-aliases:
-tags: 
-- assignment
-- cosc203
----
-
-[pdf](https://blackboard.otago.ac.nz/bbcswebdav/pid-2827493-dt-content-rid-18385743_1/courses/INFO203_S1DNIE_2022/Assignment3.pdf)
-
-[idea](203-mobile-app/idea.md)
-[brainstorming](203-mobile-app/brainstorming.md)
-
----
-Initial UI designs
-Personas and Scenarios
-Storyboard
-Low Fidelity Prototypes
-Design Descisions / informal evaluation
-High fidelity prototype
-Submission
-
-
- 
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-![300](https://i.imgur.com/wHizjAN.jpg)
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-![](Screenshot_20220409-195535_Scooter%20Trick%20Generator%201.jpg)
-![](Screenshot_20220409-195539_Scooter%20Trick%20Generator%201.jpg)
-![](Screenshot_20220409-195547_Scooter%20Trick%20Generator%201.jpg)
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-- [freestyle-generator](203-mobile-app/screenshots/freestyle-generator.md)
-- [getatrick](203-mobile-app/screenshots/getatrick.md)
-- [scooter-trick-generator](203-mobile-app/screenshots/scooter-trick-generator.md)
-- [skateboard-tricks](203-mobile-app/screenshots/skateboard-tricks.md)
-- [skate-dice](203-mobile-app/screenshots/skate-dice.md)
-- [skategen](203-mobile-app/screenshots/skategen.md)
-- [skatetricks](203-mobile-app/screenshots/skatetricks.md)
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-![](Screenshot_20220409-192642_Skate%20Dice.jpg)
-![](Screenshot_20220409-192744_Skate%20Dice.jpg)
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-![300](Screenshot_20220409-192624_Skate%20Dice.jpg)
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-![](Screenshot_20220409-193846_Skateboard%20tricks.jpg)
-![](Screenshot_20220409-193856_Skateboard%20tricks.jpg)
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-![](Screenshot_20220409-193912_Skateboard%20tricks.jpg)
-![](Screenshot_20220409-194012_Skateboard%20tricks.jpg)
-![](Screenshot_20220409-194026_Skateboard%20tricks.jpg)
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-![](Screenshot_20220409-193032_Skate%20Tricks.jpg)
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diff --git a/content/notes/13-bst-traversals-and-balance.md b/content/notes/13-bst-traversals-and-balance.md
index bc6e80f15..5ed59f5ea 100644
--- a/content/notes/13-bst-traversals-and-balance.md
+++ b/content/notes/13-bst-traversals-and-balance.md
@@ -95,4 +95,9 @@ public Arraylist<String> levelorder() {
 	}
 	return result;
 }
-```
\ No newline at end of file
+```
+
+
+if we use a stack then its the same as preorder.
+
+# Balance
\ No newline at end of file