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diff --git a/index.html b/index.html
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@@ -72,6 +72,8 @@ <h1 class="header h1" style="color: whitesmoke">Mathematica</h1>
    
 
    </div>
+
+   <a href="Primality.html" >Number System </a>
 </div>
 
     <div class="w3-container" >
@@ -92,15 +94,10 @@ <h1 class="header h1" style="color: whitesmoke">Mathematica</h1>
 <div class="row" style="width:100% margin-to:100px">
    
 
-       <a href="Primality.html"><img src="css//img//new.png" style="width: 25%"  ></a>
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-
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-
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-       <img src="css//img//final1.PNG" style="width: 25%" style="margin-left: 5000px">
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+       <a href="https://www.youtube.com/watch?v=FtztfI86pBY&list=PLr3WmPgPWZfX1HUpeyKkP6ir2wOFhqXMO"><img src="css//img//res.png" style="height:280px; width:1100px ; margin-left:110px"  > 
 
+          
+        </a>
 
        </div>
     </div>