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    <pre><code>namespace WordsFromPhoneNumber { /// &lt;summary&gt; /// Summary description for WordsFromPhoneNumber /// &lt;/summary&gt; [TestClass] public class WordsFromPhoneNumber { private static string[] Chars = { "0", "1", "ABC", "DEF", "GHI", "JKL", "MNO", "PQRS", "TUV", "WXYZ" }; public WordsFromPhoneNumber() { // // TODO: Add constructor logic here // } #region overhead private TestContext testContextInstance; /// &lt;summary&gt; ///Gets or sets the test context which provides ///information about and functionality for the current test run. ///&lt;/summary&gt; public TestContext TestContext { get { return testContextInstance; } set { testContextInstance = value; } } #region Additional test attributes // // You can use the following additional attributes as you write your tests: // // Use ClassInitialize to run code before running the first test in the class // [ClassInitialize()] // public static void MyClassInitialize(TestContext testContext) { } // // Use ClassCleanup to run code after all tests in a class have run // [ClassCleanup()] // public static void MyClassCleanup() { } // // Use TestInitialize to run code before running each test // [TestInitialize()] // public void MyTestInitialize() { } // // Use TestCleanup to run code after each test has run // [TestCleanup()] // public void MyTestCleanup() { } // #endregion [TestMethod] public void TestMethod1() { IList&lt;string&gt; words = Words(new int[] { 2 }); Assert.IsNotNull(words, "null"); Assert.IsTrue(words.Count == 3, "count"); Assert.IsTrue(words[0] == "A", "a"); Assert.IsTrue(words[1] == "B", "b"); Assert.IsTrue(words[2] == "C", "c"); } [TestMethod] public void TestMethod23() { IList&lt;string&gt; words = Words(new int[] { 2 , 3}); Assert.IsNotNull(words, "null"); Assert.AreEqual(words.Count , 9, "count"); Assert.AreEqual(words[0] , "AD", "AD"); Assert.AreEqual(words[1] , "AE", "AE"); Assert.AreEqual(words[2] , "AF", "AF"); Assert.AreEqual(words[3] , "BD", "BD"); Assert.AreEqual(words[4] , "BE", "BE"); Assert.AreEqual(words[5] , "BF", "BF"); Assert.AreEqual(words[6] , "CD", "CD"); Assert.AreEqual(words[7] , "CE", "CE"); Assert.AreEqual(words[8] , "CF", "CF"); } [TestMethod] public void TestAll() { int[] number = new int [4]; Generate(number, 0); } private void Generate(int[] number, int index) { for (int x = 0; x &lt;= 9; x += 3) { number[index] = x; if (index == number.Length - 1) { var w = Words(number); Assert.IsNotNull(w); foreach (var xx in number) { Console.Write(xx.ToString()); } Console.WriteLine(" possible words:\n"); foreach (var ww in w) { Console.Write("{0} ", ww); } Console.WriteLine("\n\n\n"); } else { Generate(number, index + 1); } } } #endregion private IList&lt;string&gt; Words(int[] number) { List&lt;string&gt; words = new List&lt;string&gt;(100); Assert.IsNotNull(number, "null"); Assert.IsTrue(number.Length &gt; 0, "length"); StringBuilder word = new StringBuilder(number.Length); AddWords(number, 0, word, words); return words; } private void AddWords(int[] number, int index, StringBuilder word, List&lt;string&gt; words) { Assert.IsTrue(index &lt; number.Length, "index &lt; length"); Assert.IsTrue(number[index] &gt;= 0, "number &gt;= 0"); Assert.IsTrue(number[index] &lt;= 9, "number &lt;= 9"); foreach (var c in Chars[number[index]].ToCharArray()) { word.Append(c); if (index &lt; number.Length - 1) { AddWords(number, index + 1, word, words); } else { words.Add(word.ToString()); } word.Length = word.Length - 1; } } } } </code></pre>
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    1. POHow can I print out all possible letter combinations a given phone number can represent?
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