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< ?php
function my_multi_col($content){
	$columns = explode("<h2>", $content);

	$i = 0;

	foreach ($columns as $column) {
		if (($i % 2) == 0){
			$return .= '<div>';
			if ($i > 1){
				$return .= "<h2>";
			} else{
				$return .= '<div><h2>';
			}
			$return .= $column;
			$return .= "</h2></div>";
			$i++;
		}

		if(isset($columns[1])){
			$content = wpautop($return);
		}else{
			$content = wpautop($content);
		}
		echo $content;
	}
}

add_filter('the_content', 'my_multi_col');

?>
</h2></div>

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.content_right, .content_left {
    width:45%;
}

.content_left {
    float:left;
}

.content_right {
    float:right;
}