diff --git a/index.html b/index.html
index 8a31fa4..b4ae721 100644
--- a/index.html
+++ b/index.html
@@ -1,7 +1,6 @@
 <!DOCTYPE html>
 <html xmlns="http://www.w3.org/1999/xhtml">
 	<head>
-		<script src="thirdparty/tsu.js"></script>
 		<script src="lib/kiwi.js"></script>
 		<script>
 			var x1 = new kiwi.Variable();
diff --git a/thirdparty/tsu.d.ts b/thirdparty/tsu.d.ts
deleted file mode 100644
index d3e14ac..0000000
--- a/thirdparty/tsu.d.ts
+++ /dev/null
@@ -1,289 +0,0 @@
-declare module tsu {
-    /**
-    * An interface for defining an iterator.
-    */
-    interface IIterator<T> {
-        /**
-        * Returns the next item from the iterator or undefined.
-        */
-        __next__(): T;
-        /**
-        * Returns this same iterator.
-        */
-        __iter__(): IIterator<T>;
-    }
-    /**
-    * An interface defining an iterable object.
-    */
-    interface IIterable<T> {
-        /**
-        * Returns an iterator over the object contents.
-        */
-        __iter__(): IIterator<T>;
-    }
-    /**
-    * An interface which defines a reversible object.
-    */
-    interface IReversible<T> {
-        /**
-        * Returns a iterator over the reversed object contents.
-        */
-        __reversed__(): IIterator<T>;
-    }
-    /**
-    * An iterator for an array of items.
-    */
-    class ArrayIterator<T> implements IIterator<T> {
-        constructor(array: T[], index?: number);
-        /**
-        * Returns the next item from the iterator or undefined.
-        */
-        public __next__(): T;
-        /**
-        * Returns this same iterator.
-        */
-        public __iter__(): ArrayIterator<T>;
-        private _array;
-        private _index;
-    }
-    /**
-    * A reverse iterator for an array of items.
-    */
-    class ReverseArrayIterator<T> implements IIterator<T> {
-        /**
-        * Construct a new ReverseArrayIterator.
-        *
-        * @param array The array of items to iterate.
-        * @param [index] The index at which to start iteration.
-        */
-        constructor(array: T[], index?: number);
-        /**
-        * Returns the next item from the iterator or undefined.
-        */
-        public __next__(): T;
-        /**
-        * Returns this same iterator.
-        */
-        public __iter__(): ReverseArrayIterator<T>;
-        private _array;
-        private _index;
-    }
-    /**
-    * Returns an iterator for the given object.
-    *
-    * @param object The array or iterable to iterate.
-    * @returns An iterator over the given object.
-    */
-    function iter<T>(object: T[]): ArrayIterator<T>;
-    function iter<T>(object: IIterable<T>): IIterator<T>;
-    /**
-    * Returns a reverse iterator for the given object.
-    *
-    * @param object The array or iterable to iterate.
-    * @returns A reverse iterator over the given object.
-    */
-    function reversed<T>(object: T[]): ReverseArrayIterator<T>;
-    function reversed<T>(object: IReversible<T>): IIterator<T>;
-    /**
-    * Returns the next value from an iterator, or undefined.
-    */
-    function next<T>(iterator: IIterator<T>): T;
-    /**
-    * Execute a function for every item in an iterable.
-    *
-    * @param object The array or iterable of items.
-    * @param callback The function to execute for each item.
-    */
-    function forEach<T>(object: T[], callback: (value: T) => any): void;
-    function forEach<T>(object: IIterable<T>, callback: (value: T) => any): void;
-}
-declare module tsu {
-    /**
-    * An interface which defines a binary comparison function.
-    *
-    * Returns:
-    *   - zero if first = second
-    *   - negative if first < second
-    *   - positive if first > second.
-    */
-    interface ICompare<T, U> {
-        (first: T, second: U): number;
-    }
-    /**
-    * A class which defines a generic pair object.
-    */
-    class Pair<T, U> {
-        public first: T;
-        public second: U;
-        /**
-        * Construct a new Pair object.
-        *
-        * @param first The first item of the pair.
-        * @param second The second item of the pair.
-        */
-        constructor(first: T, second: U);
-        /**
-        * Create a copy of the pair.
-        */
-        public copy(): Pair<T, U>;
-    }
-}
-declare module tsu {
-    /**
-    * Perform a lower bound search on a sorted array.
-    *
-    * @param array The array of sorted items to search.
-    * @param value The value to located in the array.
-    * @param compare The value comparison function.
-    * @returns The index of the first element in the array which
-    *          compares greater than or equal to the given value.
-    */
-    function lowerBound<T, U>(array: T[], value: U, compare: ICompare<T, U>): number;
-    /**
-    * Perform a binary search on a sorted array.
-    *
-    * @param array The array of sorted items to search.
-    * @param value The value to located in the array.
-    * @param compare The value comparison function.
-    * @returns The index of the found item, or -1.
-    */
-    function binarySearch<T, U>(array: T[], value: U, compare: ICompare<T, U>): number;
-    /**
-    * Perform a binary find on a sorted array.
-    *
-    * @param array The array of sorted items to search.
-    * @param value The value to located in the array.
-    * @param compare The value comparison function.
-    * @returns The found item in the array, or undefined.
-    */
-    function binaryFind<T, U>(array: T[], value: U, compare: ICompare<T, U>): T;
-}
-declare module tsu {
-    /**
-    * A base class for implementing array-based data structures.
-    *
-    * @class
-    */
-    class ArrayBase<T> implements IIterable<T>, IReversible<T> {
-        /**
-        * Returns the number of items in the array.
-        */
-        public size(): number;
-        /**
-        * Returns true if the array is empty.
-        */
-        public empty(): boolean;
-        /**
-        * Returns the item at the given array index.
-        *
-        * @param index The integer index of the desired item.
-        */
-        public itemAt(index: number): T;
-        /**
-        * Removes and returns the item at the given index.
-        *
-        * @param index The integer index of the desired item.
-        */
-        public takeAt(index: number): T;
-        /**
-        * Clear the internal contents of array.
-        */
-        public clear(): void;
-        /**
-        * Swap this array's contents with another array.
-        *
-        * @param other The array base to use for the swap.
-        */
-        public swap(other: ArrayBase<T>): void;
-        /**
-        * Returns an iterator over the array of items.
-        */
-        public __iter__(): ArrayIterator<T>;
-        /**
-        * Returns a reverse iterator over the array of items.
-        */
-        public __reversed__(): ReverseArrayIterator<T>;
-        public _array: T[];
-    }
-}
-declare module tsu {
-    /**
-    * A mapping container build on a sorted array.
-    *
-    * @class
-    */
-    class AssociativeArray<T, U> extends ArrayBase<Pair<T, U>> {
-        /**
-        * Construct a new AssociativeArray.
-        *
-        * @param compare The key comparison function.
-        */
-        constructor(compare: ICompare<T, T>);
-        /**
-        * Returns the key comparison function used by this array.
-        */
-        public comparitor(): ICompare<T, T>;
-        /**
-        * Return the array index of the given key, or -1.
-        *
-        * @param key The key to locate in the array.
-        */
-        public indexOf(key: T): number;
-        /**
-        * Returns true if the key is in the array, false otherwise.
-        *
-        * @param key The key to locate in the array.
-        */
-        public contains(key: T): boolean;
-        /**
-        * Returns the pair associated with the given key, or undefined.
-        *
-        * @param key The key to locate in the array.
-        */
-        public find(key: T): Pair<T, U>;
-        /**
-        * Returns the pair associated with the key if it exists.
-        *
-        * If the key does not exist, a new pair will be created and
-        * inserted using the value created by the given factory.
-        *
-        * @param key The key to locate in the array.
-        * @param factory The function which creates the default value.
-        */
-        public setDefault(key: T, factory: () => U): Pair<T, U>;
-        /**
-        * Insert the pair into the array and return the pair.
-        *
-        * This will overwrite any existing entry in the array.
-        *
-        * @param key The key portion of the pair.
-        * @param value The value portion of the pair.
-        */
-        public insert(key: T, value: U): Pair<T, U>;
-        /**
-        * Update the array from a collection of pairs.
-        *
-        * This will overwrite existing entries in the array.
-        *
-        * @param object The collection of pairs to add.
-        */
-        public update(object: AssociativeArray<T, U>): void;
-        public update(object: IIterable<Pair<T, U>>): void;
-        public update(object: Pair<T, U>[]): void;
-        /**
-        * Removes and returns the pair for the given key, or undefined.
-        *
-        * @param key The key to remove from the map.
-        */
-        public erase(key: T): Pair<T, U>;
-        /**
-        * Create a copy of this associative array.
-        */
-        public copy(): AssociativeArray<T, U>;
-        private _wrapped;
-        private _compare;
-    }
-}
-declare module tsu {
-}
-export = tsu;
diff --git a/thirdparty/tsu.js b/thirdparty/tsu.js
deleted file mode 100644
index 24140e8..0000000
--- a/thirdparty/tsu.js
+++ /dev/null
@@ -1,527 +0,0 @@
-/*-----------------------------------------------------------------------------
-| Copyright (c) 2014, Nucleic Development Team.
-|
-| Distributed under the terms of the Modified BSD License.
-|
-| The full license is in the file COPYING.txt, distributed with this software.
-|----------------------------------------------------------------------------*/
-/**
-* An iterator for an array of items.
-*/
-var ArrayIterator = (function () {
-    /*
-    * Construct a new ArrayIterator.
-    *
-    * @param array The array of items to iterate.
-    * @param [index] The index at which to start iteration.
-    */
-    function ArrayIterator(array, index) {
-        if (typeof index === "undefined") { index = 0; }
-        this._array = array;
-        this._index = Math.max(0, Math.min(index, array.length));
-    }
-    /**
-    * Returns the next item from the iterator or undefined.
-    */
-    ArrayIterator.prototype.__next__ = function () {
-        return this._array[this._index++];
-    };
-
-    /**
-    * Returns this same iterator.
-    */
-    ArrayIterator.prototype.__iter__ = function () {
-        return this;
-    };
-    return ArrayIterator;
-})();
-export { ArrayIterator };
-
-/**
-* A reverse iterator for an array of items.
-*/
-var ReverseArrayIterator = (function () {
-    /**
-    * Construct a new ReverseArrayIterator.
-    *
-    * @param array The array of items to iterate.
-    * @param [index] The index at which to start iteration.
-    */
-    function ReverseArrayIterator(array, index) {
-        if (typeof index === "undefined") { index = array.length; }
-        this._array = array;
-        this._index = Math.max(0, Math.min(index, array.length));
-    }
-    /**
-    * Returns the next item from the iterator or undefined.
-    */
-    ReverseArrayIterator.prototype.__next__ = function () {
-        return this._array[--this._index];
-    };
-
-    /**
-    * Returns this same iterator.
-    */
-    ReverseArrayIterator.prototype.__iter__ = function () {
-        return this;
-    };
-    return ReverseArrayIterator;
-})();
-export { ReverseArrayIterator };
-
-
-
-function iter(object) {
-    if (object instanceof Array) {
-        return new ArrayIterator(object);
-    }
-    return object.__iter__();
-}
-export { iter };
-
-
-
-function reversed(object) {
-    if (object instanceof Array) {
-        return new ReverseArrayIterator(object);
-    }
-    return object.__reversed__();
-}
-export { reversed };
-
-/**
-* Returns the next value from an iterator, or undefined.
-*/
-function next(iterator) {
-    return iterator.__next__();
-}
-export { next };
-
-
-function forEach(object, callback) {
-    if (object instanceof Array) {
-        for (var i = 0, n = object.length; i < n; ++i) {
-            if (callback(object[i]) === false) {
-                return;
-            }
-        }
-    } else {
-        var value;
-        var it = object.__iter__();
-        while ((value = it.__next__()) !== undefined) {
-            if (callback(value) === false) {
-                return;
-            }
-        }
-    }
-}
-export { forEach };
-
-/*-----------------------------------------------------------------------------
-| Copyright (c) 2014, Nucleic Development Team.
-|
-| Distributed under the terms of the Modified BSD License.
-|
-| The full license is in the file COPYING.txt, distributed with this software.
-|----------------------------------------------------------------------------*/
-
-/**
-* A class which defines a generic pair object.
-*/
-var Pair = (function () {
-    /**
-    * Construct a new Pair object.
-    *
-    * @param first The first item of the pair.
-    * @param second The second item of the pair.
-    */
-    function Pair(first, second) {
-        this.first = first;
-        this.second = second;
-    }
-    /**
-    * Create a copy of the pair.
-    */
-    Pair.prototype.copy = function () {
-        return new Pair(this.first, this.second);
-    };
-    return Pair;
-})();
-export { Pair };
-
-/*-----------------------------------------------------------------------------
-| Copyright (c) 2014, Nucleic Development Team.
-|
-| Distributed under the terms of the Modified BSD License.
-|
-| The full license is in the file COPYING.txt, distributed with this software.
-|----------------------------------------------------------------------------*/
-
-/**
-* Perform a lower bound search on a sorted array.
-*
-* @param array The array of sorted items to search.
-* @param value The value to located in the array.
-* @param compare The value comparison function.
-* @returns The index of the first element in the array which
-*          compares greater than or equal to the given value.
-*/
-function lowerBound(array, value, compare) {
-    var begin = 0;
-    var n = array.length;
-    var half;
-    var middle;
-    while (n > 0) {
-        half = n >> 1;
-        middle = begin + half;
-        if (compare(array[middle], value) < 0) {
-            begin = middle + 1;
-            n -= half + 1;
-        } else {
-            n = half;
-        }
-    }
-    return begin;
-}
-export { lowerBound };
-
-/**
-* Perform a binary search on a sorted array.
-*
-* @param array The array of sorted items to search.
-* @param value The value to located in the array.
-* @param compare The value comparison function.
-* @returns The index of the found item, or -1.
-*/
-function binarySearch(array, value, compare) {
-    var index = lowerBound(array, value, compare);
-    if (index === array.length) {
-        return -1;
-    }
-    var item = array[index];
-    if (compare(item, value) !== 0) {
-        return -1;
-    }
-    return index;
-}
-export { binarySearch };
-
-/**
-* Perform a binary find on a sorted array.
-*
-* @param array The array of sorted items to search.
-* @param value The value to located in the array.
-* @param compare The value comparison function.
-* @returns The found item in the array, or undefined.
-*/
-function binaryFind(array, value, compare) {
-    var index = lowerBound(array, value, compare);
-    if (index === array.length) {
-        return undefined;
-    }
-    var item = array[index];
-    if (compare(item, value) !== 0) {
-        return undefined;
-    }
-    return item;
-}
-export { binaryFind };
-
-/*-----------------------------------------------------------------------------
-| Copyright (c) 2014, Nucleic Development Team.
-|
-| Distributed under the terms of the Modified BSD License.
-|
-| The full license is in the file COPYING.txt, distributed with this software.
-|----------------------------------------------------------------------------*/
-
-/**
-* A base class for implementing array-based data structures.
-*
-* @class
-*/
-var ArrayBase = (function () {
-    function ArrayBase() {
-        /*
-        * The internal data array.
-        *
-        * @protected
-        */
-        this._array = [];
-    }
-    /**
-    * Returns the number of items in the array.
-    */
-    ArrayBase.prototype.size = function () {
-        return this._array.length;
-    };
-
-    /**
-    * Returns true if the array is empty.
-    */
-    ArrayBase.prototype.empty = function () {
-        return this._array.length === 0;
-    };
-
-    /**
-    * Returns the item at the given array index.
-    *
-    * @param index The integer index of the desired item.
-    */
-    ArrayBase.prototype.itemAt = function (index) {
-        return this._array[index];
-    };
-
-    /**
-    * Removes and returns the item at the given index.
-    *
-    * @param index The integer index of the desired item.
-    */
-    ArrayBase.prototype.takeAt = function (index) {
-        return this._array.splice(index, 1)[0];
-    };
-
-    /**
-    * Clear the internal contents of array.
-    */
-    ArrayBase.prototype.clear = function () {
-        this._array = [];
-    };
-
-    /**
-    * Swap this array's contents with another array.
-    *
-    * @param other The array base to use for the swap.
-    */
-    ArrayBase.prototype.swap = function (other) {
-        var array = this._array;
-        this._array = other._array;
-        other._array = array;
-    };
-
-    /**
-    * Returns an iterator over the array of items.
-    */
-    ArrayBase.prototype.__iter__ = function () {
-        return iter(this._array);
-    };
-
-    /**
-    * Returns a reverse iterator over the array of items.
-    */
-    ArrayBase.prototype.__reversed__ = function () {
-        return reversed(this._array);
-    };
-    return ArrayBase;
-})();
-export { ArrayBase };
-
-/*-----------------------------------------------------------------------------
-| Copyright (c) 2014, Nucleic Development Team.
-|
-| Distributed under the terms of the Modified BSD License.
-|
-| The full license is in the file COPYING.txt, distributed with this software.
-|----------------------------------------------------------------------------*/
-var __extends = (this && this.__extends) || function (d, b) {
-for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p];
-function __() { this.constructor = d; }
-__.prototype = b.prototype;
-d.prototype = new __();
-};
-
-/**
-* A mapping container build on a sorted array.
-*
-* @class
-*/
-var AssociativeArray = (function (_super) {
-    __extends(AssociativeArray, _super);
-    /**
-    * Construct a new AssociativeArray.
-    *
-    * @param compare The key comparison function.
-    */
-    function AssociativeArray(compare) {
-        _super.call(this);
-        this._compare = compare;
-        this._wrapped = wrapCompare(compare);
-    }
-    /**
-    * Returns the key comparison function used by this array.
-    */
-    AssociativeArray.prototype.comparitor = function () {
-        return this._compare;
-    };
-
-    /**
-    * Return the array index of the given key, or -1.
-    *
-    * @param key The key to locate in the array.
-    */
-    AssociativeArray.prototype.indexOf = function (key) {
-        return binarySearch(this._array, key, this._wrapped);
-    };
-
-    /**
-    * Returns true if the key is in the array, false otherwise.
-    *
-    * @param key The key to locate in the array.
-    */
-    AssociativeArray.prototype.contains = function (key) {
-        return binarySearch(this._array, key, this._wrapped) >= 0;
-    };
-
-    /**
-    * Returns the pair associated with the given key, or undefined.
-    *
-    * @param key The key to locate in the array.
-    */
-    AssociativeArray.prototype.find = function (key) {
-        return binaryFind(this._array, key, this._wrapped);
-    };
-
-    /**
-    * Returns the pair associated with the key if it exists.
-    *
-    * If the key does not exist, a new pair will be created and
-    * inserted using the value created by the given factory.
-    *
-    * @param key The key to locate in the array.
-    * @param factory The function which creates the default value.
-    */
-    AssociativeArray.prototype.setDefault = function (key, factory) {
-        var array = this._array;
-        var index = lowerBound(array, key, this._wrapped);
-        if (index === array.length) {
-            var pair = new Pair(key, factory());
-            array.push(pair);
-            return pair;
-        }
-        var currPair = array[index];
-        if (this._compare(currPair.first, key) !== 0) {
-            var pair = new Pair(key, factory());
-            array.splice(index, 0, pair);
-            return pair;
-        }
-        return currPair;
-    };
-
-    /**
-    * Insert the pair into the array and return the pair.
-    *
-    * This will overwrite any existing entry in the array.
-    *
-    * @param key The key portion of the pair.
-    * @param value The value portion of the pair.
-    */
-    AssociativeArray.prototype.insert = function (key, value) {
-        var array = this._array;
-        var index = lowerBound(array, key, this._wrapped);
-        if (index === array.length) {
-            var pair = new Pair(key, value);
-            array.push(pair);
-            return pair;
-        }
-        var currPair = array[index];
-        if (this._compare(currPair.first, key) !== 0) {
-            var pair = new Pair(key, value);
-            array.splice(index, 0, pair);
-            return pair;
-        }
-        currPair.second = value;
-        return currPair;
-    };
-
-    AssociativeArray.prototype.update = function (object) {
-        var _this = this;
-        if (object instanceof AssociativeArray) {
-            var obj = object;
-            this._array = merge(this._array, obj._array, this._compare);
-        } else {
-            forEach(object, function (pair) {
-                _this.insert(pair.first, pair.second);
-            });
-        }
-    };
-
-    /**
-    * Removes and returns the pair for the given key, or undefined.
-    *
-    * @param key The key to remove from the map.
-    */
-    AssociativeArray.prototype.erase = function (key) {
-        var array = this._array;
-        var index = binarySearch(array, key, this._wrapped);
-        if (index < 0) {
-            return undefined;
-        }
-        return array.splice(index, 1)[0];
-    };
-
-    /**
-    * Create a copy of this associative array.
-    */
-    AssociativeArray.prototype.copy = function () {
-        var theCopy = new AssociativeArray(this._compare);
-        var copyArray = theCopy._array;
-        var thisArray = this._array;
-        for (var i = 0, n = thisArray.length; i < n; ++i) {
-            copyArray.push(thisArray[i].copy());
-        }
-        return theCopy;
-    };
-    return AssociativeArray;
-})(ArrayBase);
-export { AssociativeArray };
-
-/**
-* An internal which wraps a comparison key function.
-*/
-function wrapCompare(cmp) {
-    return function (pair, value) {
-        return cmp(pair.first, value);
-    };
-}
-
-/**
-* An internal function which merges two ordered pair arrays.
-*/
-function merge(first, second, compare) {
-    var i = 0, j = 0;
-    var len1 = first.length;
-    var len2 = second.length;
-    var merged = [];
-    while (i < len1 && j < len2) {
-        var a = first[i];
-        var b = second[j];
-        var v = compare(a.first, b.first);
-        if (v < 0) {
-            merged.push(a.copy());
-            ++i;
-        } else if (v > 0) {
-            merged.push(b.copy());
-            ++j;
-        } else {
-            merged.push(b.copy());
-            ++i;
-            ++j;
-        }
-    }
-    while (i < len1) {
-        merged.push(first[i].copy());
-        ++i;
-    }
-    while (j < len2) {
-        merged.push(second[j].copy());
-        ++j;
-    }
-    return merged;
-}
-/*-----------------------------------------------------------------------------
-| Copyright (c) 2014, Nucleic Development Team.
-|
-| Distributed under the terms of the Modified BSD License.
-|
-| The full license is in the file COPYING.txt, distributed with this software.
-|----------------------------------------------------------------------------*/
