index.php
<?php
include "connect.php";
echo "a:".($a);
echo "<br>";
echo "b:".($b);
echo "<br>";
echo "c:"."$c";
echo "<br>";
echo "d:"."$d";
echo "<br>";
echo "e:"."$e";
connect.php
<?php
$a="1";
$b="2";
$c=$a+$b;
$d=$c+"5";
$e="10"/"3";
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