This computer science problem involves algorithmic thinking and programming concepts. The solution below explains the approach, logic, and implementation step by step.

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Here is the HTML code to produce the expected webpage:
<!DOCTYPE html>
<html>
<head>
<title>Arab</title>
<style>
body {
background-color: grey;
}
h1 {
text-align: center;
}
</style>
</head>
<body>
<h1>Four African Arab countries</h1>
<p>The African Arab countries are found in the northern part of African.</p>
<p>The Arab countries are given below:</p>
<ol>
<li>Egypt</li>
<li>Morocco</li>
<li>Lybia</li>
<li>Tunisia</li>
</ol>
</body>
</html>
Explanation of the code:
Step 1: Set up the basic HTML document structure.
The <!DOCTYPE html> declaration defines the document type. The <html> tag is the root element. The <head> section contains meta-information about the document, and the <body> section contains the visible page content.
Step 2: Add the title and background color.
Inside the <head> section, <title>Arab</title> sets the title of the webpage to "Arab". A <style> block is used to define CSS rules. body { background-color: grey; } sets the background color of the entire page to grey.
Step 3: Create the centered H1 header.
Inside the <body> section, <h1>Four African Arab countries</h1> creates a main heading. The CSS rule h1 { text-align: center; } within the <style> block centers this heading on the page.
Step 4: Add the first paragraph.
A paragraph is added using the <p> tag: <p>The African Arab countries are found in the northern part of African.</p>.
Step 5: Add the ordered list.
Another paragraph is added before the list: <p>The Arab countries are given below:</p>. An ordered list is created using the <ol> tag, and each list item is added using the <li> tag:
<li>Egypt</li>
<li>Morocco</li>
<li>Lybia</li>
<li>Tunisia</li>
To save the webpage, you would copy this code into a text editor (like Notepad, VS Code, or Sublime Text) and save the file as Arab.html. Then, you can open this file in any web browser to view the result.
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This computer science problem involves algorithmic thinking and programming concepts. The solution below explains the approach, logic, and implementation step by step.