Help me in solving HTML12 problem

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About Greece

Greece officially the Hellenic Republic is a country in south East Europe. Greece has the longest coastline on the Mediterranean Basin, featuring thousands of islands.

importance of Greece

Greece is considered the cradle of Western civilization, being the birthplace of democracy,Western philosophy, Western literature, historiography, political science, major scientific and mathematical principles, theatre and the Olympic Games. tell me where i do wrong code

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// your code goes here

Learning course: Learn HTML / CSS
Problem Link: Recap Practice Problem in Learn HTML / CSS - CodeChef

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I got where do wrong code in it

<h2>About Greece</h2>
<p><u>Greece</u> officially the Hellenic Republic is a country in south East Europe.<br> Greece has the longest coastline on the Mediterranean Basin, featuring thousands of islands.</p> 

<h2>Importance of Greece</h2>
<p><i>Greece is considered the cradle of Western civilization, being the birthplace of democracy, Western philosophy, Western literature, historiography, political science, major scientific and mathematical principles, theatre and the Olympic Games.</i></p>