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   // FUNCTIONS
      // ================================================================================
      // Creates a Function called "adder" that takes three arguments (x, y, z).
      function adder(x, y, z) {
        // The function should add the arguments together, and log the result to the console.
        console.log(x + y + z);
      }
      // We can also create a version of "adder" that returns its result.
      function adderReturn(x, y, z) {
        return x + y + z;
      }
      // Creates a Function called "multiplier" that takes three arguments (x, y, z).
      function multiplier(x, y, z) {
        // The function should multiply the arguments, and log the result to the console.
        console.log(x * y * z);
      }
      // We can also create a version of "multiplier" that returns its result.
      function multiplierReturn(x, y, z) {
        return x * y * z;
      }
      // Creates a Function called "isString" that takes three arguments (x, y, z).
      function isString(x, y, z) {
        // isString checks if each argument is a string using typeof.
        // If each argument is a string it will note that.
        if (typeof x === "string" && typeof y === "string" && typeof z === "string") {
          console.log("Yep. They are all strings");
        }
        // If anyone of them is NOT a string... it will note that.
        else {
          console.log("No... I don't believe these are strings.");
        }
      }
      // Creates a Function called "vowelChecker" that takes in a single argument (x).
      function vowelChecker(x) {
        // vowelChecker will grab the first letter (character)...
        var firstChar = x.toLowerCase().charAt(0);
        // Then check if that first letter is a vowel.
        if (firstChar === "a" || firstChar === "e" || firstChar === "i" || firstChar === "o" || firstChar === "u") {
          // If so... it will log that.
          console.log("OMG. The first letter is a vowel!");
        }
        else {
          // If not... it will log that.
          console.log("First letter is NOT a vowel. *sadface*");
        }
      }
      // FUNCTION EXECUTION
      // ================================================================================
      // Each of the below lines of code is what actually "calls" or "runs" the functions.
      // Without the below code, the functions above are like workers just waiting to be called into action.
      // Calling our adder function.
      adder(1, 2, 3);
      console.log("-------------------");
      // If we use the version that returns its result:
      var result = adderReturn(1, 2, 3);
      console.log(result);
      console.log("-------------------");
      // Calling our multiplier function.
      multiplier(2, 3, 4);
      console.log("-------------------");
      // If we use the version that returns its result:
      result = multiplierReturn(2, 3, 4);
      console.log(result);
      console.log("-------------------");
      // Calling our isString function.
      isString("Ahmed", "Bad", "Monkey");
      isString(2, "Way", "Street");
      console.log("-------------------");
      // Calling our vowelChecker function.
      vowelChecker("Eek");
      vowelChecker("Nah");