diff --git a/README.md b/README.md
index 143d575..7ee10bb 100644
--- a/README.md
+++ b/README.md
@@ -11,7 +11,7 @@
 - create `pairs`
 - create all combinations `of N` elements
 - create all combinations `of A 2 B` elements
-
+- create all combinations between multiple arrays
 
 ## 2. Contents
 - [1. Features](#1-features)
@@ -163,7 +163,7 @@ The max index number of array in PHP equals to `PHP_INT_MAX`.
     ```php
     <?php
 
-    require_once('../vendor/autoload.php');
+    require_once __DIR__ . '/../vendor/autoload.php';
 
     use Macocci7\PhpCombination\Combination;
 
@@ -198,7 +198,7 @@ The max index number of array in PHP equals to `PHP_INT_MAX`.
     ```php
     <?php
 
-    require_once('../vendor/autoload.php');
+    require_once __DIR__ . '/../vendor/autoload.php';
 
     use Macocci7\PhpCombination\CombinationGenerator;
 
@@ -233,7 +233,7 @@ The max index number of array in PHP equals to `PHP_INT_MAX`.
     ```php
     <?php
 
-    require_once('../vendor/autoload.php');
+    require_once __DIR__ . '/../vendor/autoload.php';
 
     use Macocci7\PhpCombination\Combination;
 
@@ -415,7 +415,7 @@ The max index number of array in PHP equals to `PHP_INT_MAX`.
     ```php
     <?php
 
-    require_once('../vendor/autoload.php');
+    require_once __DIR__ . '/../vendor/autoload.php';
 
     use Macocci7\PhpCombination\Combination;
 
@@ -600,7 +600,7 @@ The max index number of array in PHP equals to `PHP_INT_MAX`.
     ```php
     <?php
 
-    require_once('../vendor/autoload.php');
+    require_once __DIR__ . '/../vendor/autoload.php';
 
     use Macocci7\PhpCombination\CombinationGenerator;
 
@@ -821,6 +821,11 @@ with patterns of `size`, `color` and `amount`.
             return $data;
         }
 
+        /**
+        * PHPDoc for PHPUnit 9.x
+        * @dataProvider provide_order_can_order_correctly
+        */
+        // Attribute for PHPUnit 10.x or later
         #[DataProvider('provide_order_can_order_correctly')]
         public function test_order_can_order_correctly(
             int $productId,
@@ -843,13 +848,13 @@ with patterns of `size`, `color` and `amount`.
 
     ```bash
     $ vendor/bin/phpunit ./examples/UseInPhpUnitTest.php --color=auto --testdox
-    PHPUnit 10.5.18 by Sebastian Bergmann and contributors.
+    PHPUnit 10.5.19 by Sebastian Bergmann and contributors.
 
-    Runtime:       PHP 8.2.13
+    Runtime:       PHP 8.1.26
 
     ........................                                          24 / 24 (100%)
 
-    Time: 00:00.076, Memory: 8.00 MB
+    Time: 00:00.053, Memory: 8.00 MB
 
     Use In Php Unit (Macocci7\PhpCombination\UseInPhpUnit)
     ✔ Order can order correctly with 1101,·S,·White,·1
@@ -883,30 +888,30 @@ with patterns of `size`, `color` and `amount`.
 - Result: LOG
 
     ```log
-    [2024-04-18T00:25:01.221482+00:00] UseInPhpUnit.INFO: Adding a new order {"productId":1101,"size":"S","color":"White","amount":1} []
-    [2024-04-18T00:25:01.237957+00:00] UseInPhpUnit.INFO: Adding a new order {"productId":1101,"size":"S","color":"White","amount":2} []
-    [2024-04-18T00:25:01.238915+00:00] UseInPhpUnit.INFO: Adding a new order {"productId":1101,"size":"S","color":"Black","amount":1} []
-    [2024-04-18T00:25:01.239725+00:00] UseInPhpUnit.INFO: Adding a new order {"productId":1101,"size":"S","color":"Black","amount":2} []
-    [2024-04-18T00:25:01.240554+00:00] UseInPhpUnit.INFO: Adding a new order {"productId":1101,"size":"M","color":"White","amount":1} []
-    [2024-04-18T00:25:01.241492+00:00] UseInPhpUnit.INFO: Adding a new order {"productId":1101,"size":"M","color":"White","amount":2} []
-    [2024-04-18T00:25:01.242484+00:00] UseInPhpUnit.INFO: Adding a new order {"productId":1101,"size":"M","color":"Black","amount":1} []
-    [2024-04-18T00:25:01.243489+00:00] UseInPhpUnit.INFO: Adding a new order {"productId":1101,"size":"M","color":"Black","amount":2} []
-    [2024-04-18T00:25:01.247389+00:00] UseInPhpUnit.INFO: Adding a new order {"productId":1101,"size":"L","color":"White","amount":1} []
-    [2024-04-18T00:25:01.248891+00:00] UseInPhpUnit.INFO: Adding a new order {"productId":1101,"size":"L","color":"White","amount":2} []
-    [2024-04-18T00:25:01.250689+00:00] UseInPhpUnit.INFO: Adding a new order {"productId":1101,"size":"L","color":"Black","amount":1} []
-    [2024-04-18T00:25:01.251705+00:00] UseInPhpUnit.INFO: Adding a new order {"productId":1101,"size":"L","color":"Black","amount":2} []
-    [2024-04-18T00:25:01.252559+00:00] UseInPhpUnit.INFO: Adding a new order {"productId":1102,"size":"S","color":"White","amount":1} []
-    [2024-04-18T00:25:01.253453+00:00] UseInPhpUnit.INFO: Adding a new order {"productId":1102,"size":"S","color":"White","amount":2} []
-    [2024-04-18T00:25:01.255659+00:00] UseInPhpUnit.INFO: Adding a new order {"productId":1102,"size":"S","color":"Black","amount":1} []
-    [2024-04-18T00:25:01.257999+00:00] UseInPhpUnit.INFO: Adding a new order {"productId":1102,"size":"S","color":"Black","amount":2} []
-    [2024-04-18T00:25:01.259445+00:00] UseInPhpUnit.INFO: Adding a new order {"productId":1102,"size":"M","color":"White","amount":1} []
-    [2024-04-18T00:25:01.260728+00:00] UseInPhpUnit.INFO: Adding a new order {"productId":1102,"size":"M","color":"White","amount":2} []
-    [2024-04-18T00:25:01.262897+00:00] UseInPhpUnit.INFO: Adding a new order {"productId":1102,"size":"M","color":"Black","amount":1} []
-    [2024-04-18T00:25:01.265152+00:00] UseInPhpUnit.INFO: Adding a new order {"productId":1102,"size":"M","color":"Black","amount":2} []
-    [2024-04-18T00:25:01.266253+00:00] UseInPhpUnit.INFO: Adding a new order {"productId":1102,"size":"L","color":"White","amount":1} []
-    [2024-04-18T00:25:01.267110+00:00] UseInPhpUnit.INFO: Adding a new order {"productId":1102,"size":"L","color":"White","amount":2} []
-    [2024-04-18T00:25:01.267956+00:00] UseInPhpUnit.INFO: Adding a new order {"productId":1102,"size":"L","color":"Black","amount":1} []
-    [2024-04-18T00:25:01.270784+00:00] UseInPhpUnit.INFO: Adding a new order {"productId":1102,"size":"L","color":"Black","amount":2} []
+    [2024-04-18T00:46:47.065595+00:00] UseInPhpUnit.INFO: Adding a new order {"productId":1101,"size":"S","color":"White","amount":1} []
+    [2024-04-18T00:46:47.069266+00:00] UseInPhpUnit.INFO: Adding a new order {"productId":1101,"size":"S","color":"White","amount":2} []
+    [2024-04-18T00:46:47.070687+00:00] UseInPhpUnit.INFO: Adding a new order {"productId":1101,"size":"S","color":"Black","amount":1} []
+    [2024-04-18T00:46:47.072942+00:00] UseInPhpUnit.INFO: Adding a new order {"productId":1101,"size":"S","color":"Black","amount":2} []
+    [2024-04-18T00:46:47.074656+00:00] UseInPhpUnit.INFO: Adding a new order {"productId":1101,"size":"M","color":"White","amount":1} []
+    [2024-04-18T00:46:47.077154+00:00] UseInPhpUnit.INFO: Adding a new order {"productId":1101,"size":"M","color":"White","amount":2} []
+    [2024-04-18T00:46:47.078569+00:00] UseInPhpUnit.INFO: Adding a new order {"productId":1101,"size":"M","color":"Black","amount":1} []
+    [2024-04-18T00:46:47.079828+00:00] UseInPhpUnit.INFO: Adding a new order {"productId":1101,"size":"M","color":"Black","amount":2} []
+    [2024-04-18T00:46:47.080988+00:00] UseInPhpUnit.INFO: Adding a new order {"productId":1101,"size":"L","color":"White","amount":1} []
+    [2024-04-18T00:46:47.082439+00:00] UseInPhpUnit.INFO: Adding a new order {"productId":1101,"size":"L","color":"White","amount":2} []
+    [2024-04-18T00:46:47.083968+00:00] UseInPhpUnit.INFO: Adding a new order {"productId":1101,"size":"L","color":"Black","amount":1} []
+    [2024-04-18T00:46:47.084862+00:00] UseInPhpUnit.INFO: Adding a new order {"productId":1101,"size":"L","color":"Black","amount":2} []
+    [2024-04-18T00:46:47.085751+00:00] UseInPhpUnit.INFO: Adding a new order {"productId":1102,"size":"S","color":"White","amount":1} []
+    [2024-04-18T00:46:47.086692+00:00] UseInPhpUnit.INFO: Adding a new order {"productId":1102,"size":"S","color":"White","amount":2} []
+    [2024-04-18T00:46:47.090893+00:00] UseInPhpUnit.INFO: Adding a new order {"productId":1102,"size":"S","color":"Black","amount":1} []
+    [2024-04-18T00:46:47.092489+00:00] UseInPhpUnit.INFO: Adding a new order {"productId":1102,"size":"S","color":"Black","amount":2} []
+    [2024-04-18T00:46:47.094058+00:00] UseInPhpUnit.INFO: Adding a new order {"productId":1102,"size":"M","color":"White","amount":1} []
+    [2024-04-18T00:46:47.095176+00:00] UseInPhpUnit.INFO: Adding a new order {"productId":1102,"size":"M","color":"White","amount":2} []
+    [2024-04-18T00:46:47.096440+00:00] UseInPhpUnit.INFO: Adding a new order {"productId":1102,"size":"M","color":"Black","amount":1} []
+    [2024-04-18T00:46:47.099292+00:00] UseInPhpUnit.INFO: Adding a new order {"productId":1102,"size":"M","color":"Black","amount":2} []
+    [2024-04-18T00:46:47.100918+00:00] UseInPhpUnit.INFO: Adding a new order {"productId":1102,"size":"L","color":"White","amount":1} []
+    [2024-04-18T00:46:47.102176+00:00] UseInPhpUnit.INFO: Adding a new order {"productId":1102,"size":"L","color":"White","amount":2} []
+    [2024-04-18T00:46:47.103248+00:00] UseInPhpUnit.INFO: Adding a new order {"productId":1102,"size":"L","color":"Black","amount":1} []
+    [2024-04-18T00:46:47.106206+00:00] UseInPhpUnit.INFO: Adding a new order {"productId":1102,"size":"L","color":"Black","amount":2} []
     ```
 
 ## 9. Examples
diff --git a/composer.json b/composer.json
index 03e3aab..1a26673 100644
--- a/composer.json
+++ b/composer.json
@@ -1,6 +1,6 @@
 {
     "name": "macocci7/php-combination",
-    "version": "1.0.4",
+    "version": "1.0.5",
     "description": "a simple PHP library to make combinations",
     "type": "library",
     "license": "MIT",
@@ -21,9 +21,10 @@
         "phpunit/phpunit": "^10.5",
         "phpmd/phpmd": "^2.15",
         "phpstan/phpstan": "^1.10",
-        "php-parallel-lint/php-parallel-lint": "^1.3"
+        "php-parallel-lint/php-parallel-lint": "^1.3",
+        "monolog/monolog": "^3.5"
     },
     "require": {
-        "monolog/monolog": "^3.5"
+        "php": ">=8.1"
     }
 }
diff --git a/examples/BasicUsage.php b/examples/BasicUsage.php
index 018f64c..1b3d2dc 100644
--- a/examples/BasicUsage.php
+++ b/examples/BasicUsage.php
@@ -1,6 +1,6 @@
 <?php
 
-require_once('../vendor/autoload.php');
+require_once __DIR__ . '/../vendor/autoload.php';
 
 use Macocci7\PhpCombination\Combination;
 
diff --git a/examples/BasicUsageGenerator.php b/examples/BasicUsageGenerator.php
index f7d6ff5..268eaff 100644
--- a/examples/BasicUsageGenerator.php
+++ b/examples/BasicUsageGenerator.php
@@ -1,6 +1,6 @@
 <?php
 
-require_once('../vendor/autoload.php');
+require_once __DIR__ . '/../vendor/autoload.php';
 
 use Macocci7\PhpCombination\CombinationGenerator;
 
diff --git a/examples/UseCombination.php b/examples/UseCombination.php
index b9680bc..9f26b7b 100644
--- a/examples/UseCombination.php
+++ b/examples/UseCombination.php
@@ -1,6 +1,6 @@
 <?php
 
-require_once('../vendor/autoload.php');
+require_once __DIR__ . '/../vendor/autoload.php';
 
 use Macocci7\PhpCombination\Combination;
 
diff --git a/examples/UseCombinationGenerator.php b/examples/UseCombinationGenerator.php
index 9258814..aec3746 100644
--- a/examples/UseCombinationGenerator.php
+++ b/examples/UseCombinationGenerator.php
@@ -1,6 +1,6 @@
 <?php
 
-require_once('../vendor/autoload.php');
+require_once __DIR__ . '/../vendor/autoload.php';
 
 use Macocci7\PhpCombination\CombinationGenerator;
 
diff --git a/examples/UseCombinationSort.php b/examples/UseCombinationSort.php
index 1f6ba50..188e976 100644
--- a/examples/UseCombinationSort.php
+++ b/examples/UseCombinationSort.php
@@ -1,6 +1,6 @@
 <?php
 
-require_once('../vendor/autoload.php');
+require_once __DIR__ . '/../vendor/autoload.php';
 
 use Macocci7\PhpCombination\Combination;
 
diff --git a/examples/UseInPhpUnit.log b/examples/UseInPhpUnit.log
index 6ce8b54..3d05230 100644
--- a/examples/UseInPhpUnit.log
+++ b/examples/UseInPhpUnit.log
@@ -1,24 +1,24 @@
-[2024-04-18T00:25:01.221482+00:00] UseInPhpUnit.INFO: Adding a new order {"productId":1101,"size":"S","color":"White","amount":1} []
-[2024-04-18T00:25:01.237957+00:00] UseInPhpUnit.INFO: Adding a new order {"productId":1101,"size":"S","color":"White","amount":2} []
-[2024-04-18T00:25:01.238915+00:00] UseInPhpUnit.INFO: Adding a new order {"productId":1101,"size":"S","color":"Black","amount":1} []
-[2024-04-18T00:25:01.239725+00:00] UseInPhpUnit.INFO: Adding a new order {"productId":1101,"size":"S","color":"Black","amount":2} []
-[2024-04-18T00:25:01.240554+00:00] UseInPhpUnit.INFO: Adding a new order {"productId":1101,"size":"M","color":"White","amount":1} []
-[2024-04-18T00:25:01.241492+00:00] UseInPhpUnit.INFO: Adding a new order {"productId":1101,"size":"M","color":"White","amount":2} []
-[2024-04-18T00:25:01.242484+00:00] UseInPhpUnit.INFO: Adding a new order {"productId":1101,"size":"M","color":"Black","amount":1} []
-[2024-04-18T00:25:01.243489+00:00] UseInPhpUnit.INFO: Adding a new order {"productId":1101,"size":"M","color":"Black","amount":2} []
-[2024-04-18T00:25:01.247389+00:00] UseInPhpUnit.INFO: Adding a new order {"productId":1101,"size":"L","color":"White","amount":1} []
-[2024-04-18T00:25:01.248891+00:00] UseInPhpUnit.INFO: Adding a new order {"productId":1101,"size":"L","color":"White","amount":2} []
-[2024-04-18T00:25:01.250689+00:00] UseInPhpUnit.INFO: Adding a new order {"productId":1101,"size":"L","color":"Black","amount":1} []
-[2024-04-18T00:25:01.251705+00:00] UseInPhpUnit.INFO: Adding a new order {"productId":1101,"size":"L","color":"Black","amount":2} []
-[2024-04-18T00:25:01.252559+00:00] UseInPhpUnit.INFO: Adding a new order {"productId":1102,"size":"S","color":"White","amount":1} []
-[2024-04-18T00:25:01.253453+00:00] UseInPhpUnit.INFO: Adding a new order {"productId":1102,"size":"S","color":"White","amount":2} []
-[2024-04-18T00:25:01.255659+00:00] UseInPhpUnit.INFO: Adding a new order {"productId":1102,"size":"S","color":"Black","amount":1} []
-[2024-04-18T00:25:01.257999+00:00] UseInPhpUnit.INFO: Adding a new order {"productId":1102,"size":"S","color":"Black","amount":2} []
-[2024-04-18T00:25:01.259445+00:00] UseInPhpUnit.INFO: Adding a new order {"productId":1102,"size":"M","color":"White","amount":1} []
-[2024-04-18T00:25:01.260728+00:00] UseInPhpUnit.INFO: Adding a new order {"productId":1102,"size":"M","color":"White","amount":2} []
-[2024-04-18T00:25:01.262897+00:00] UseInPhpUnit.INFO: Adding a new order {"productId":1102,"size":"M","color":"Black","amount":1} []
-[2024-04-18T00:25:01.265152+00:00] UseInPhpUnit.INFO: Adding a new order {"productId":1102,"size":"M","color":"Black","amount":2} []
-[2024-04-18T00:25:01.266253+00:00] UseInPhpUnit.INFO: Adding a new order {"productId":1102,"size":"L","color":"White","amount":1} []
-[2024-04-18T00:25:01.267110+00:00] UseInPhpUnit.INFO: Adding a new order {"productId":1102,"size":"L","color":"White","amount":2} []
-[2024-04-18T00:25:01.267956+00:00] UseInPhpUnit.INFO: Adding a new order {"productId":1102,"size":"L","color":"Black","amount":1} []
-[2024-04-18T00:25:01.270784+00:00] UseInPhpUnit.INFO: Adding a new order {"productId":1102,"size":"L","color":"Black","amount":2} []
+[2024-04-18T00:46:47.065595+00:00] UseInPhpUnit.INFO: Adding a new order {"productId":1101,"size":"S","color":"White","amount":1} []
+[2024-04-18T00:46:47.069266+00:00] UseInPhpUnit.INFO: Adding a new order {"productId":1101,"size":"S","color":"White","amount":2} []
+[2024-04-18T00:46:47.070687+00:00] UseInPhpUnit.INFO: Adding a new order {"productId":1101,"size":"S","color":"Black","amount":1} []
+[2024-04-18T00:46:47.072942+00:00] UseInPhpUnit.INFO: Adding a new order {"productId":1101,"size":"S","color":"Black","amount":2} []
+[2024-04-18T00:46:47.074656+00:00] UseInPhpUnit.INFO: Adding a new order {"productId":1101,"size":"M","color":"White","amount":1} []
+[2024-04-18T00:46:47.077154+00:00] UseInPhpUnit.INFO: Adding a new order {"productId":1101,"size":"M","color":"White","amount":2} []
+[2024-04-18T00:46:47.078569+00:00] UseInPhpUnit.INFO: Adding a new order {"productId":1101,"size":"M","color":"Black","amount":1} []
+[2024-04-18T00:46:47.079828+00:00] UseInPhpUnit.INFO: Adding a new order {"productId":1101,"size":"M","color":"Black","amount":2} []
+[2024-04-18T00:46:47.080988+00:00] UseInPhpUnit.INFO: Adding a new order {"productId":1101,"size":"L","color":"White","amount":1} []
+[2024-04-18T00:46:47.082439+00:00] UseInPhpUnit.INFO: Adding a new order {"productId":1101,"size":"L","color":"White","amount":2} []
+[2024-04-18T00:46:47.083968+00:00] UseInPhpUnit.INFO: Adding a new order {"productId":1101,"size":"L","color":"Black","amount":1} []
+[2024-04-18T00:46:47.084862+00:00] UseInPhpUnit.INFO: Adding a new order {"productId":1101,"size":"L","color":"Black","amount":2} []
+[2024-04-18T00:46:47.085751+00:00] UseInPhpUnit.INFO: Adding a new order {"productId":1102,"size":"S","color":"White","amount":1} []
+[2024-04-18T00:46:47.086692+00:00] UseInPhpUnit.INFO: Adding a new order {"productId":1102,"size":"S","color":"White","amount":2} []
+[2024-04-18T00:46:47.090893+00:00] UseInPhpUnit.INFO: Adding a new order {"productId":1102,"size":"S","color":"Black","amount":1} []
+[2024-04-18T00:46:47.092489+00:00] UseInPhpUnit.INFO: Adding a new order {"productId":1102,"size":"S","color":"Black","amount":2} []
+[2024-04-18T00:46:47.094058+00:00] UseInPhpUnit.INFO: Adding a new order {"productId":1102,"size":"M","color":"White","amount":1} []
+[2024-04-18T00:46:47.095176+00:00] UseInPhpUnit.INFO: Adding a new order {"productId":1102,"size":"M","color":"White","amount":2} []
+[2024-04-18T00:46:47.096440+00:00] UseInPhpUnit.INFO: Adding a new order {"productId":1102,"size":"M","color":"Black","amount":1} []
+[2024-04-18T00:46:47.099292+00:00] UseInPhpUnit.INFO: Adding a new order {"productId":1102,"size":"M","color":"Black","amount":2} []
+[2024-04-18T00:46:47.100918+00:00] UseInPhpUnit.INFO: Adding a new order {"productId":1102,"size":"L","color":"White","amount":1} []
+[2024-04-18T00:46:47.102176+00:00] UseInPhpUnit.INFO: Adding a new order {"productId":1102,"size":"L","color":"White","amount":2} []
+[2024-04-18T00:46:47.103248+00:00] UseInPhpUnit.INFO: Adding a new order {"productId":1102,"size":"L","color":"Black","amount":1} []
+[2024-04-18T00:46:47.106206+00:00] UseInPhpUnit.INFO: Adding a new order {"productId":1102,"size":"L","color":"Black","amount":2} []
diff --git a/tests/CombinationGeneratorTest.php b/tests/CombinationGeneratorTest.php
index 840e1a3..2e8f886 100644
--- a/tests/CombinationGeneratorTest.php
+++ b/tests/CombinationGeneratorTest.php
@@ -4,8 +4,6 @@
 
 namespace Macocci7\PhpCombination;
 
-require('vendor/autoload.php');
-
 use PHPUnit\Framework\Attributes\DataProvider;
 use PHPUnit\Framework\TestCase;
 use Macocci7\PhpCombination\Util;
diff --git a/tests/CombinationTest.php b/tests/CombinationTest.php
index 3c36226..04b5395 100644
--- a/tests/CombinationTest.php
+++ b/tests/CombinationTest.php
@@ -4,8 +4,6 @@
 
 namespace Macocci7\PhpCombination;
 
-require('vendor/autoload.php');
-
 use PHPUnit\Framework\Attributes\DataProvider;
 use PHPUnit\Framework\TestCase;
 use Macocci7\PhpCombination\Util;
diff --git a/tests/UtilTest.php b/tests/UtilTest.php
index 83f13fa..8fb1bf8 100644
--- a/tests/UtilTest.php
+++ b/tests/UtilTest.php
@@ -4,8 +4,6 @@
 
 namespace Macocci7\PhpCombination;
 
-require('vendor/autoload.php');
-
 use PHPUnit\Framework\Attributes\DataProvider;
 use PHPUnit\Framework\TestCase;
 use Macocci7\PhpCombination\Util;