Removed unused feature.

Optimized use statements in main.

Simplified truth_combinations code a little.

Updated OpenAPI spec

spec/main.tsp

@@ -1,38 +1,75 @@
 import "@typespec/http";
 import "@typespec/versioning";
 import "./models.tsp";
+import "./response.tsp";
+import "./options.tsp";
 using TypeSpec.Http;
 using TypeSpec.Versioning;
 using Models;
+using Responses;
+using Options;
+
+/**
+ * A service to simplify truth expressions, and generate truth tables.
+ */
+@service({
+  title: "Simplify Truth API",
+})
+@versioned(Version)
+namespace SimplifyTruths;
 
 enum Version {
-    v2
+  v2,
 }
 
-@versioned(Version)
-@service({
-    title: "Simplify Truth Expressions",
-    description: "Simplify truth expressions",
-})
-namespace Simplify {
-    model SimplifyResponse {
-        before: string;
-        after: string;
-        orderOfOperations?: string[] = [];
-        expression: Expression;
-    }
+@tag("Common")
+interface Index {
+  /**
+   * Information about this API.
+   */
+  @get
+  @summary("Information")
+  index(): InfoResponse;
 
-    model SimplifyOptions {
-        lang: "en" | "nb" = "en";
-        simplify: boolean = true;
-        caseSensitive: boolean = false;
-    }
+  /**
+   * The OpenAPI specification for this API.
+   */
+  @get
+  @route("/openapi")
+  @summary("The OpenAPI specification")
+  openAPI(): HTML;
 
-    @route("/simplify")
-    interface Simplify {
-        @get op simplify(
-            @path exp: string,
-            @query query?: SimplifyOptions
-        ): SimplifyResponse;
-    }
+  /**
+   * Check if an expression is valid.
+   */
+  @get
+  @tag("Expression")
+  @route("/is-valid")
+  @summary("Check if an expression is valid")
+  isValid(@path exp: string): IsValidResponse;
+}
+
+@tag("Expression")
+@route("/simplify")
+interface Simplify {
+  @get
+  @summary("Simplify a truth expression")
+  simplify(@path exp: string, @query query?: SimplifyOptions): SimplifyResponse;
+
+  @get
+  @tag("Table")
+  @route("/table")
+  @summary("Simplify and generate a truth table")
+  simplifyTable(
+    @path exp: string,
+    @query query?: SimplifyTableOptions,
+  ): SimplifyTableResponse;
+}
+
+@tag("Table")
+@route("/table")
+interface TruthTable {
+  @get
+  @summary("Generate a truth table")
+  simplify(@path exp: string, @query query?: TableOptions): TruthTableResponse;
 }