diff --git a/www/internals/adventofcode.php b/www/internals/adventofcode.php
index 1e64e18..6727462 100644
--- a/www/internals/adventofcode.php
+++ b/www/internals/adventofcode.php
@@ -71,7 +71,7 @@ class AdventOfCode
 		return array_keys($this->staticData);
 	}
 
-	public static function readSingle($year, $a)
+	private static function readSingle($year, $a)
 	{
 		$yeardata = self::YEARS[$year];
 
diff --git a/www/internals/books.php b/www/internals/books.php
index b2199ea..01fcddd 100644
--- a/www/internals/books.php
+++ b/www/internals/books.php
@@ -19,7 +19,7 @@ class Books
 		$this->staticData = array_map(function($a){return self::readSingle($a);}, $all);
 	}
 
-	public static function readSingle($a)
+	private static function readSingle($a)
 	{
 		$a['imgfront_url']      =              '/data/images/book_img/' . $a['id'] . '_front.png';
 		$a['imgfront_path']     = __DIR__ . '/../data/images/book_img/' . $a['id'] . '_front.png';
diff --git a/www/internals/euler.php b/www/internals/euler.php
index a3c0dcc..66b4b13 100644
--- a/www/internals/euler.php
+++ b/www/internals/euler.php
@@ -1,8 +1,25 @@
 <?php
 
+require_once 'website.php';
+
 class Euler
 {
-	public static function readSingle($a)
+	/** @var array */
+	private $staticData;
+
+	public function __construct()
+	{
+		$this->load();
+	}
+
+	private function load()
+	{
+		$all = require (__DIR__ . '/../statics/blog/__all.php');
+
+		$this->staticData = array_map(function($a){return self::readSingle($a);}, $all);
+	}
+
+	private static function readSingle($a)
 	{
 		$n3p = str_pad($a['number'], 3, '0', STR_PAD_LEFT);
 		$a['number3'] = $n3p;
@@ -25,33 +42,7 @@ class Euler
 		return $a;
 	}
 
-	public static function listAll()
-	{
-		$all = require (__DIR__ . '/../statics/euler/__all.php');
-
-		return array_map('self::readSingle', $all);
-	}
-
-	public static function getEulerProblemFromStrIdent($ident)
-	{
-		$e = explode('-', $ident, 2); // problem-xxx
-		if (count($e)!==2) return null;
-
-		$i = intval($e[1], 10);
-		if ($i == 0) return null;
-
-		return self::getEulerProblem($i);
-	}
-
-	public static function getEulerProblem($num)
-	{
-		foreach (self::listAll() as $ep) {
-			if ($ep['number'] == $num) return $ep;
-		}
-		return null;
-	}
-
-	public static function rateTime($problem)
+	private static function rateTime($problem)
 	{
 		if ($problem['time'] < 100) // < 100ms
 			return 0;
@@ -68,14 +59,40 @@ class Euler
 		return 4;
 	}
 
-	public static function checkConsistency()
+	public function listAll()
+	{
+		return $this->staticData;
+	}
+
+	public function getEulerProblemFromStrIdent($ident)
+	{
+		$e = explode('-', $ident, 2); // problem-xxx
+		if (count($e)!==2) return null;
+
+		$i = intval($e[1], 10);
+		if ($i == 0) return null;
+
+		return self::getEulerProblem($i);
+	}
+
+	public function getEulerProblem($num)
+	{
+		foreach (self::listAll() as $ep) {
+			if ($ep['number'] == $num) return $ep;
+		}
+		return null;
+	}
+
+	public function checkConsistency()
 	{
 		$warn = null;
 
+		$this->load();
+
 		$numbers = [];
 		$realname = [];
 
-		foreach (self::listAll() as $ep)
+		foreach ($this->staticData as $ep)
 		{
 			if (in_array($ep['number'], $numbers)) return ['result'=>'err', 'message' => 'Duplicate number ' . $ep['number']];
 			$numbers []= $ep['number'];
diff --git a/www/internals/website.php b/www/internals/website.php
index ca91737..ded064f 100644
--- a/www/internals/website.php
+++ b/www/internals/website.php
@@ -21,6 +21,7 @@ class Website
 	/** @var AdventOfCode|null */ private $adventOfCode = null;
 	/** @var Blog|null */         private $blog = null;
 	/** @var Books|null */        private $books = null;
+	/** @var Euler|null */        private $euler = null;
 
 	public function init()
 	{
@@ -182,6 +183,12 @@ class Website
 		return $this->books;
 	}
 
+	public function Euler()
+	{
+		if ($this->euler === null) { require_once 'euler.php'; $this->euler = new Euler(); }
+		return $this->euler;
+	}
+
 
 
 	/**