diff --git a/src/Chapter13.Tests/Table03.03.Tests.cs b/src/Chapter13.Tests/Table03.03.Tests.cs
deleted file mode 100644
index b21fd7a6b..000000000
--- a/src/Chapter13.Tests/Table03.03.Tests.cs
+++ /dev/null
@@ -1,47 +0,0 @@
-using AddisonWesley.Michaelis.EssentialCSharp.Shared.Tests;
-using Microsoft.VisualStudio.TestTools.UnitTesting;
-
-namespace AddisonWesley.Michaelis.EssentialCSharp.Chapter03.Table03_03.Tests;
-
-[TestClass]
-public class ArrayHighlightsTests
-{
-    public TestContext TestContext { get; set; } = null!; // Set by MSTest;
-
-#if !NET6_0_OR_GREATER
-    [TestMethod]
-    /* 1. */ [DataRow(".a", "CS8773")]
-    ///* 2. */ [DataRow(".b", "CS1525", "CS1002", "CS1002", "CS1513", "CS1002", "CS1513", "CS1002")]
-    ///* 3. */ [DataRow(".c", "CS0270")]
-    ///* 4. */ [DataRow(".d", "CS1586")]
-    ///* 5. */ [DataRow(".e", "CS0847")]
-    ///* 9. */ [DataRow(".i", "CS0847")]
-    public async Task ParseAndCompile(string fileNameSuffix, params string[] errorIds)
-    {
-        await CompilerAssert.CompileAsync($"Table13.01{fileNameSuffix}.LambdaExpressionNotesAndExamples.cs", errorIds);
-    }
-    #endif // !NET6_0_OR_GREATER
-    // 6.
-    //[TestMethod]
-    //[ExpectedException(typeof(IndexOutOfRangeException))]
-    //public void IndexingOffTheEndOfArrayTest()
-    //{
-    //    CommonArayCodingErrors.IndexingOffTheEndOfArray();
-    //}
-
-    // 7.
-    //[TestMethod]
-    //[ExpectedException(typeof(IndexOutOfRangeException))]
-    //public void Hat0IsOnePastTheEndOfTheArray1Test()
-    //{
-    //    CommonArayCodingErrors.Hat0IsOnePastTheEndOfTheArray1();
-    //}
-
-    // 8.
-    //[TestMethod]
-    //[ExpectedException(typeof(IndexOutOfRangeException))]
-    //public void Hat0IsOnePastTheEndOfTheArray2Test()
-    //{
-    //    CommonArayCodingErrors.LastItemIsLengthMinus1();
-    //}
-}
\ No newline at end of file
diff --git a/src/Chapter13.Tests/Table13.01.Tests.cs b/src/Chapter13.Tests/Table13.01.Tests.cs
new file mode 100644
index 000000000..9a6dba85d
--- /dev/null
+++ b/src/Chapter13.Tests/Table13.01.Tests.cs
@@ -0,0 +1,28 @@
+using AddisonWesley.Michaelis.EssentialCSharp.Shared.Tests;
+using Microsoft.VisualStudio.TestTools.UnitTesting;
+
+namespace AddisonWesley.Michaelis.EssentialCSharp.Chapter13.Table13_01.Tests;
+
+[TestClass]
+public class LambdaHighlightTests
+{
+    public TestContext TestContext { get; set; } = null!; // Set by MSTest;
+
+    [TestMethod]
+    /* 1. */ [DataRow(".a", "CS0023")]
+    /* 2. */ [DataRow(".b", "CS0837")]
+    /* 3. */ [DataRow(".c", "CS0029", "CS1662")]
+    /* 5. */ [DataRow(".e", "CS8070", "CS1632")]
+    /* 6. */ [DataRow(".f", "CS0103")]
+    /* 7. */ [DataRow(".g", "CS0165")]
+    /* 8. */ [DataRow(".h", "CS0165")]
+    public async Task ParseAndCompile(string fileNameSuffix, params string[] errorIds)
+    {
+        await CompilerAssert.CompileAsync($"Table13.01{fileNameSuffix}.LambdaExpressionNotesAndExamples.cs", errorIds);
+    }
+
+    [TestMethod]
+    public void PatternMatchingOnTypeTest(){
+        LambdaExpressionNotesAndExamples.PatternMatchingOnType();
+    }
+}
\ No newline at end of file
diff --git a/src/Chapter13/Chapter13.csproj b/src/Chapter13/Chapter13.csproj
index 7550d9fc5..f04af9c29 100644
--- a/src/Chapter13/Chapter13.csproj
+++ b/src/Chapter13/Chapter13.csproj
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
     <ChapterNumber>13</ChapterNumber>
-    <LangVersion>9.0</LangVersion>
+    <LangVersion>10.0</LangVersion>
   </PropertyGroup>
   <Import Project="..\Chapter.props" />
   <ItemGroup>
diff --git a/src/Chapter13/Table13.01.a.LambdaExpressionNotesAndExamples.cs b/src/Chapter13/Table13.01.a.LambdaExpressionNotesAndExamples.cs
index cb507442a..f3a458211 100644
--- a/src/Chapter13/Table13.01.a.LambdaExpressionNotesAndExamples.cs
+++ b/src/Chapter13/Table13.01.a.LambdaExpressionNotesAndExamples.cs
@@ -3,15 +3,15 @@
 
 namespace AddisonWesley.Michaelis.EssentialCSharp.Chapter13.Table13_01;
 
-public partial class CommonArayCodingErrors
+public partial class LambdaExpressionNotesAndExamples
 {
     // 1.
-    static public void SquareBracketsOnVariableRatherThanType()
+    static public void AccessingMemberMethods()
     {
-//#if COMPILEERROR
 #if !NET6_0_OR_GREATER
-        var v = (int x) => x;
+        //ERROR: Operator "." cannot be applied to
+        //operand of type "lambda expression"
+        string s = ((int x) => x).ToString();
 #endif
-//#endif // COMPILEERROR
     }
 }
diff --git a/src/Chapter13/Table13.01.b.LambdaExpressionNotesAndExamples.cs b/src/Chapter13/Table13.01.b.LambdaExpressionNotesAndExamples.cs
new file mode 100644
index 000000000..6ba4d1e3d
--- /dev/null
+++ b/src/Chapter13/Table13.01.b.LambdaExpressionNotesAndExamples.cs
@@ -0,0 +1,20 @@
+// Justification: Only snippets of source code shown for elucidation.
+#pragma warning disable CS0168 // Variable is declared but never used
+
+namespace AddisonWesley.Michaelis.EssentialCSharp.Chapter13.Table13_01;
+
+public partial class LambdaExpressionNotesAndExamples
+{
+    // 2.
+    static public void PatternMatchingOnType()
+    {
+//#if COMPILEERROR
+#if !NET6_0_OR_GREATER
+        //ERROR: The first operand of an "is" or "as"
+        //operator may not be a lambda expression or
+        //anonymous method
+        bool b = ((int x) => x) is Func<int,int>;
+#endif
+//#endif // COMPILEERROR
+    }
+}
diff --git a/src/Chapter13/Table13.01.c.LambdaExpressionNotesAndExamples.cs b/src/Chapter13/Table13.01.c.LambdaExpressionNotesAndExamples.cs
new file mode 100644
index 000000000..43b01d222
--- /dev/null
+++ b/src/Chapter13/Table13.01.c.LambdaExpressionNotesAndExamples.cs
@@ -0,0 +1,19 @@
+// Justification: Only snippets of source code shown for elucidation.
+#pragma warning disable CS0168 // Variable is declared but never used
+
+namespace AddisonWesley.Michaelis.EssentialCSharp.Chapter13.Table13_01;
+
+public partial class LambdaExpressionNotesAndExamples
+{
+    // 3.
+    static public void ConvertingToImproperDelegate()
+    {
+//#if COMPILEERROR
+#if !NET6_0_OR_GREATER
+        //ERROR: Lambda expression is not compatible
+        //with Func<int, bool> type
+        Func<int, bool> f = (int x) => x;
+#endif
+//#endif // COMPILEERROR
+    }
+}
diff --git a/src/Chapter13/Table13.01.d.LambdaExpressionNotesAndExamples.cs b/src/Chapter13/Table13.01.d.LambdaExpressionNotesAndExamples.cs
new file mode 100644
index 000000000..8a6d95ac3
--- /dev/null
+++ b/src/Chapter13/Table13.01.d.LambdaExpressionNotesAndExamples.cs
@@ -0,0 +1,20 @@
+// Justification: Only snippets of source code shown for elucidation.
+#pragma warning disable CS0168 // Variable is declared but never used
+
+namespace AddisonWesley.Michaelis.EssentialCSharp.Chapter13.Table13_01;
+
+public partial class LambdaExpressionNotesAndExamples
+{
+    // 4.
+    static public void TypeInferenceOfExpression()
+    {
+//#if COMPILEERROR
+#if !NET6_0_OR_GREATER
+        //ERROR: You cannot assign lambda
+        //expression to an implicitly
+        //typed local variable prior C#10
+        var v = (int x) => x;
+#endif
+//#endif // COMPILEERROR
+    }
+}
diff --git a/src/Chapter13/Table13.01.e.LambdaExpressionNotesAndExamples.cs b/src/Chapter13/Table13.01.e.LambdaExpressionNotesAndExamples.cs
new file mode 100644
index 000000000..c27ac3e8b
--- /dev/null
+++ b/src/Chapter13/Table13.01.e.LambdaExpressionNotesAndExamples.cs
@@ -0,0 +1,30 @@
+// Justification: Only snippets of source code shown for elucidation.
+#pragma warning disable CS0168 // Variable is declared but never used
+
+namespace AddisonWesley.Michaelis.EssentialCSharp.Chapter13.Table13_01;
+
+public partial class LambdaExpressionNotesAndExamples
+{
+    // 5.
+    static public void JumpStatementsToOutOfScopeDestinations()
+    {
+//#if COMPILEERROR
+#if !NET6_0_OR_GREATER
+        //ERROR: Control cannot leave the body of an
+        //anonymous method or lambda expression
+       string[] args = {"/File", "fileThatMostCertainlyDoesNotExist"};
+       Func<string> f;
+       switch(args[0])
+       {
+        case "/File":
+            f = () =>
+            {
+                if (!File.Exists(args[1]))
+                    break;
+                return args[1];
+            };
+       }
+#endif
+//#endif // COMPILEERROR
+    }
+}
diff --git a/src/Chapter13/Table13.01.f.LambdaExpressionNotesAndExamples.cs b/src/Chapter13/Table13.01.f.LambdaExpressionNotesAndExamples.cs
new file mode 100644
index 000000000..f3ba95308
--- /dev/null
+++ b/src/Chapter13/Table13.01.f.LambdaExpressionNotesAndExamples.cs
@@ -0,0 +1,21 @@
+// Justification: Only snippets of source code shown for elucidation.
+#pragma warning disable CS0168 // Variable is declared but never used
+
+namespace AddisonWesley.Michaelis.EssentialCSharp.Chapter13.Table13_01;
+
+public partial class LambdaExpressionNotesAndExamples
+{
+    // 6.
+    static public void AccessingParametersAndLocalsOutOfBody()
+    {
+//#if COMPILEERROR
+#if !NET6_0_OR_GREATER
+    //ERROR: The name "first" does not
+    //exist in the current context
+    Func <int, int, bool> expression =
+        (first, second) => first > second;
+    first++;
+#endif
+//#endif // COMPILEERROR
+    }
+}
diff --git a/src/Chapter13/Table13.01.g.LambdaExpressionNotesAndExamples.cs b/src/Chapter13/Table13.01.g.LambdaExpressionNotesAndExamples.cs
new file mode 100644
index 000000000..02ef83033
--- /dev/null
+++ b/src/Chapter13/Table13.01.g.LambdaExpressionNotesAndExamples.cs
@@ -0,0 +1,24 @@
+// Justification: Only snippets of source code shown for elucidation.
+#pragma warning disable CS0168 // Variable is declared but never used
+
+namespace AddisonWesley.Michaelis.EssentialCSharp.Chapter13.Table13_01;
+
+public partial class LambdaExpressionNotesAndExamples
+{
+    // 7.
+    static public void UsingOutParameters()
+    {
+//#if COMPILEERROR
+#if !NET6_0_OR_GREATER
+    int number;
+    Func <string, bool> f =
+        text => int.TryParse(text, out number);
+    if (f("1"))
+    {
+      //ERROR: Use of unassigned local variable
+        System.Console.Write(number);
+    }
+#endif
+//#endif // COMPILEERROR
+    }
+}
diff --git a/src/Chapter13/Table13.01.h.LambdaExpressionNotesAndExamples.cs b/src/Chapter13/Table13.01.h.LambdaExpressionNotesAndExamples.cs
new file mode 100644
index 000000000..e7ee77ac3
--- /dev/null
+++ b/src/Chapter13/Table13.01.h.LambdaExpressionNotesAndExamples.cs
@@ -0,0 +1,24 @@
+// Justification: Only snippets of source code shown for elucidation.
+#pragma warning disable CS0168 // Variable is declared but never used
+
+namespace AddisonWesley.Michaelis.EssentialCSharp.Chapter13.Table13_01;
+
+public partial class LambdaExpressionNotesAndExamples
+{
+    // 8.
+    static public void CompilerWillNotDetectInLambdaAssignment()
+    {
+//#if COMPILEERROR
+#if !NET6_0_OR_GREATER
+    int number;
+    Func<int, bool> isFortyTwo =
+        x => 42 == (number = x);
+    if(isFortyTwo(42))
+    {
+      //ERROR: Use of unassigned local variable
+        System.Console.Write(number);
+    }
+#endif
+//#endif // COMPILEERROR
+    }
+}