diff --git a/README.md b/README.md
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+++ b/README.md
@@ -8,29 +8,31 @@ Some are in Jupyter (IPython) notebooks, some in `.py` files. You can view the f
# Index of Jupyter (IPython) Notebooks
-|Logic and Number Puzzles|
+|Programming Examples|
|---|
|[Advent of Code 2017](https://github.com/norvig/pytudes/blob/master/ipynb/Advent%202017.ipynb)
*Puzzle site with a coding puzzle each day for Advent 2017.*|
|[Advent of Code 2016](https://github.com/norvig/pytudes/blob/master/ipynb/Advent%20of%20Code.ipynb)
*Puzzle site with a coding puzzle each day for Advent 2016*.|
-|[The Devil and the Coin Flip Game](https://github.com/norvig/pytudes/blob/master/ipynb/Coin%20Flip.ipynb)
*How to beat the Devil at his own game.*|
+|[Project Euler Utilities](https://github.com/norvig/pytudes/blob/master/ipynb/Project%20Euler%20Utils.ipynb)
*My utility functions for the Project Euler problems, including `Primes` and `Factors`.*|
|[Translating English Sentences into Propositional Logic Statements](https://github.com/norvig/pytudes/blob/master/ipynb/PropositionalLogic.ipynb)
*Automatically converting informal English sentences into formal Propositional Logic.*|
+|[Beal's Conjecture Revisited](https://github.com/norvig/pytudes/blob/master/ipynb/Beal.ipynb)
*A search for counterexamples to Beal's Conjecture*|
+|[WWW: Who WIll Win (NBA Title)?](https://github.com/norvig/pytudes/blob/master/ipynb/WWW.ipynb)
*Computing the probability of winning the NBA title, for my home town Warriors, or any other team.*|
+|[Pickleball Tournament](https://github.com/norvig/pytudes/blob/master/ipynb/Pickleball.ipynb)
*Scheduling a doubles tournament fairly and efficiently.*|
+|[Conway's Game of Life](https://github.com/norvig/pytudes/blob/master/ipynb/Life.ipynb)
*The cellular automata zero-player game.*|
+|[A Chaos Game with Triangles](https://github.com/norvig/pytudes/blob/master/ipynb/Sierpinski.ipynb)
*A surprising appearance of the Sierpinski triangle in a random walk between vertexes.*|
+|[Generating Mazes](https://github.com/norvig/pytudes/blob/master/ipynb/Maze.ipynb)
*Make a maze by generating a random tree superimposed on a grid.*|
+
+
+|Logic and Number Puzzles|
+|---|
+|[When is Cheryl's Birthday?](https://github.com/norvig/pytudes/blob/master/ipynb/Cheryl.ipynb)
*Solving the "Cheryl's Birthday" logic puzzle.*|
+|[When Cheryl Met Eve: A Birthday Story](https://github.com/norvig/pytudes/blob/master/ipynb/Cheryl-and-Eve.ipynb)
*Inventing new puzzles in the Style of Cheryl's Birthday.*|
+|[The Devil and the Coin Flip Game](https://github.com/norvig/pytudes/blob/master/ipynb/Coin%20Flip.ipynb)
*How to beat the Devil at his own game.*|
|[The Puzzle of the Misanthropic Neighbors](https://github.com/norvig/pytudes/blob/master/ipynb/Mean%20Misanthrope%20Density.ipynb)
*How crowded will this neighborhood be, if nobody wants to live next door to anyone else?*|
|[Four 4s, Five 5s, and Countdown to 2016](https://github.com/norvig/pytudes/blob/master/ipynb/Countdown.ipynb)
*Solving the equation 10 _ 9 _ 8 _ 7 _ 6 _ 5 _ 4 _ 3 _ 2 _ 1 = 2016. From an Alex Bellos puzzle.*|
|[Sicherman Dice](https://github.com/norvig/pytudes/blob/master/ipynb/Sicherman%20Dice.ipynb)
*Find a pair of dice that is like a regular pair of dice, only different.*|
-|[Beal's Conjecture Revisited](https://github.com/norvig/pytudes/blob/master/ipynb/Beal.ipynb)
*A search for counterexamples to Beal's Conjecture*|
-|[When is Cheryl's Birthday?](https://github.com/norvig/pytudes/blob/master/ipynb/Cheryl.ipynb)
*Solving the "Cheryl's Birthday" logic puzzle.*|
-|[When Cheryl Met Eve: A Birthday Story](https://github.com/norvig/pytudes/blob/master/ipynb/Cheryl-and-Eve.ipynb)
*Inventing new puzzles in the Style of Cheryl's Birthday.*|
|[Sol Golomb's Rectangle Puzzle](https://github.com/norvig/pytudes/blob/master/ipynb/Golomb-Puzzle.ipynb)
*A Puzzle involving placing rectangles of different sizes inside a square. Bonus: cryptarithmetic.*|
-|[WWW: Who WIll Win (NBA Title)?](https://github.com/norvig/pytudes/blob/master/ipynb/WWW.ipynb)
*Computing the probability of winning the NBA title, for my home town Warriors, or any other team.*|
-|[The Riddler: Battle Royale](https://github.com/norvig/pytudes/blob/master/ipynb/Riddler%20Battle%20Royale.ipynb)
*A puzzle involving allocating your troops and going up against an opponent.*|
-|Math Concepts|
-|---|
-|[A Concrete Introduction to Probability](https://github.com/norvig/pytudes/blob/master/ipynb/Probability.ipynb)
*Code and examples of the basic principles of Probability Theory.*|
-|[Probability, Paradox, and the Reasonable Person Principle](https://github.com/norvig/pytudes/blob/master/ipynb/ProbabilityParadox.ipynb)
*Some classic paradoxes in Probability Theory, and how to think about disagreements.*|
-|[Symbolic Algebra, Simplification, and Differentiation](https://github.com/norvig/pytudes/blob/master/ipynb/Differentiation.ipynb)
*A computer algebra system that manipulates expressions, including symbolic differentiation.*|
-|[Economics Simulation](https://github.com/norvig/pytudes/blob/master/ipynb/Economics.ipynb)
*A simulation of a simple economic game.*|
-|[How to Count Things](https://github.com/norvig/pytudes/blob/master/ipynb/How%20To%20Count%20Things.ipynb)
*Combinatorial math: how to count how many things there are, when there are a lot of them.*|
+|[The Riddler: Battle Royale](https://github.com/norvig/pytudes/blob/master/ipynb/Riddler%20Battle%20Royale.ipynb)
*A puzzle involving allocating your troops and going up against an opponent.*|
|Word Games|
|---|
@@ -44,16 +46,21 @@ Some are in Jupyter (IPython) notebooks, some in `.py` files. You can view the f
|[Gesture Typing](https://github.com/norvig/pytudes/blob/master/ipynb/Gesture%20Typing.ipynb)
*What word has the longest path on a gesture-typing smartphone keyboard?*|
|[How to Do Things with Words, or Statistical Natural Language Processing in Python](https://github.com/norvig/pytudes/blob/master/ipynb/How%20to%20Do%20Things%20with%20Words.ipynb)
*Spelling Correction, Secret Codes, Word Segmentation, and more: grab your bag of words.*|
-|Computer Science Algorithms, Concepts, and Problems|
+|Math Concepts|
+|---|
+|[A Concrete Introduction to Probability](https://github.com/norvig/pytudes/blob/master/ipynb/Probability.ipynb)
*Code and examples of the basic principles of Probability Theory.*|
+|[Probability, Paradox, and the Reasonable Person Principle](https://github.com/norvig/pytudes/blob/master/ipynb/ProbabilityParadox.ipynb)
*Some classic paradoxes in Probability Theory, and how to think about disagreements.*|
+|[Symbolic Algebra, Simplification, and Differentiation](https://github.com/norvig/pytudes/blob/master/ipynb/Differentiation.ipynb)
*A computer algebra system that manipulates expressions, including symbolic differentiation.*|
+|[Economics Simulation](https://github.com/norvig/pytudes/blob/master/ipynb/Economics.ipynb)
*A simulation of a simple economic game.*|
+|[How to Count Things](https://github.com/norvig/pytudes/blob/master/ipynb/How%20To%20Count%20Things.ipynb)
*Combinatorial math: how to count how many things there are, when there are a lot of them.*|
+
+|Computer Science Algorithms and Concepts|
|---|
|[BASIC Interpreter](https://github.com/norvig/pytudes/blob/master/ipynb/BASIC.ipynb)
*How to write an interpreter for the BASIC programming language.*|
|[Bad Grade, Good Experience](https://github.com/norvig/pytudes/blob/master/ipynb/Snobol.ipynb)
*As a student, did you ever get a bad grade on a programming assignment? (Snobol, Concordance)*|
-|[Conway's Game of Life](https://github.com/norvig/pytudes/blob/master/ipynb/Life.ipynb)
*The cellular automata zero-player game.*|
-|[A Chaos Game with Triangles](https://github.com/norvig/pytudes/blob/master/ipynb/Sierpinski.ipynb)
*A surprising appearance of the Sierpinski triangle in a random walk between vertexes.*|
|[The Convex Hull Problem](https://github.com/norvig/pytudes/blob/master/ipynb/Convex%20Hull.ipynb)
*A classic Computer Science Algorithm.*|
|[The Traveling Salesperson Problem](https://github.com/norvig/pytudes/blob/master/ipynb/TSP.ipynb)
*Another of the classics.*|
-|[Generating Mazes](https://github.com/norvig/pytudes/blob/master/ipynb/Maze.ipynb)
*Make a maze by generating a random tree superimposed on a grid.*|
-|[Project Euler Utilities](https://github.com/norvig/pytudes/blob/master/ipynb/Project%20Euler%20Utils.ipynb)
*My utility functions for the Project Euler problems, including `Primes` and `Factors`.*|
+
# Index of Python Files