diff --git a/src/FactorGraphs/FactorGraphLayer.php b/src/FactorGraphs/FactorGraphLayer.php
index 52639a5..ca2cb8c 100644
--- a/src/FactorGraphs/FactorGraphLayer.php
+++ b/src/FactorGraphs/FactorGraphLayer.php
@@ -1,6 +1,7 @@
 <?php
 
 namespace DNW\Skills\FactorGraphs;
+
 use DNW\Skills\FactorGraphs\ScheduleSequence;
 use DNW\Skills\TrueSkill\TrueSkillFactorGraph;
 
@@ -12,11 +13,11 @@ abstract class FactorGraphLayer
     private array $localFactors = [];
 
     /**
-     * @var array<int,array<int,object>> 
+     * @var array<int,array<int,object>>
      */
     private array $outputVariablesGroups = [];
     /**
-     * @var array<int,array<int,object>> 
+     * @var array<int,array<int,object>>
      */
     private $inputVariablesGroups = [];
 
diff --git a/src/TrueSkill/FactorGraphTrueSkillCalculator.php b/src/TrueSkill/FactorGraphTrueSkillCalculator.php
index fc9acfe..a89f334 100644
--- a/src/TrueSkill/FactorGraphTrueSkillCalculator.php
+++ b/src/TrueSkill/FactorGraphTrueSkillCalculator.php
@@ -120,7 +120,7 @@ class FactorGraphTrueSkillCalculator extends SkillCalculator
         );
     }
 
-    
+
     /**
      * Helper function that gets a list of values for all player ratings
      * @param Team[] $teamAssignmentsList
diff --git a/src/TrueSkill/Layers/PlayerPerformancesToTeamPerformancesLayer.php b/src/TrueSkill/Layers/PlayerPerformancesToTeamPerformancesLayer.php
index 47ba4d4..490b47a 100644
--- a/src/TrueSkill/Layers/PlayerPerformancesToTeamPerformancesLayer.php
+++ b/src/TrueSkill/Layers/PlayerPerformancesToTeamPerformancesLayer.php
@@ -8,8 +8,8 @@ use DNW\Skills\PartialPlay;
 use DNW\Skills\Player;
 use DNW\Skills\Team;
 use DNW\Skills\TrueSkill\Factors\GaussianWeightedSumFactor;
-use DNW\Skills\FactorGraphs\Variable; 
-use DNW\Skills\FactorGraphs\KeyedVariable; 
+use DNW\Skills\FactorGraphs\Variable;
+use DNW\Skills\FactorGraphs\KeyedVariable;
 
 class PlayerPerformancesToTeamPerformancesLayer extends TrueSkillFactorGraphLayer
 {
diff --git a/src/TrueSkill/Layers/PlayerPriorValuesToSkillsLayer.php b/src/TrueSkill/Layers/PlayerPriorValuesToSkillsLayer.php
index 55fa357..d25c6a5 100644
--- a/src/TrueSkill/Layers/PlayerPriorValuesToSkillsLayer.php
+++ b/src/TrueSkill/Layers/PlayerPriorValuesToSkillsLayer.php
@@ -69,7 +69,7 @@ class PlayerPriorValuesToSkillsLayer extends TrueSkillFactorGraphLayer
         );
     }
 
-    private function createSkillOutputVariable(mixed $key) : KeyedVariable
+    private function createSkillOutputVariable(mixed $key): KeyedVariable
     {
         $parentFactorGraph = $this->getParentFactorGraph();
         $variableFactory = $parentFactorGraph->getVariableFactory();