diff --git a/JL.Core/Dicts/EPWING/Yomichan/EpwingYomichanLoader.cs b/JL.Core/Dicts/EPWING/Yomichan/EpwingYomichanLoader.cs
index c03dcf4a..764b79c0 100644
--- a/JL.Core/Dicts/EPWING/Yomichan/EpwingYomichanLoader.cs
+++ b/JL.Core/Dicts/EPWING/Yomichan/EpwingYomichanLoader.cs
@@ -15,7 +15,7 @@ public static async Task Load(Dict dict)
         }
 
         IEnumerable<string> jsonFiles = Directory.EnumerateFiles(fullPath, "*_bank_*.json", SearchOption.TopDirectoryOnly)
-            .Where(static s => s.Contains("term", StringComparison.Ordinal) || s.Contains("kanji", StringComparison.Ordinal));
+            .Where(static s => Utils.ValidYomichanFileSuffixes.Contains(s));
 
         bool nonKanjiDict = dict.Type is not DictType.NonspecificKanjiWithWordSchemaYomichan;
         bool nonNameDict = dict.Type is not DictType.NonspecificNameYomichan;
diff --git a/JL.Core/Freqs/FrequencyYomichan/FrequencyYomichanLoader.cs b/JL.Core/Freqs/FrequencyYomichan/FrequencyYomichanLoader.cs
index ca3aa16c..494f2595 100644
--- a/JL.Core/Freqs/FrequencyYomichan/FrequencyYomichanLoader.cs
+++ b/JL.Core/Freqs/FrequencyYomichan/FrequencyYomichanLoader.cs
@@ -16,7 +16,7 @@ public static async Task Load(Freq freq)
         }
 
         IEnumerable<string> jsonFiles = Directory.EnumerateFiles(fullPath, "*_bank_*.json", SearchOption.TopDirectoryOnly)
-            .Where(static s => s.Contains("term", StringComparison.Ordinal) || s.Contains("kanji", StringComparison.Ordinal));
+            .Where(static s => Utils.ValidYomichanFileSuffixes.Contains(s));
 
         foreach (string jsonFile in jsonFiles)
         {
diff --git a/JL.Core/Utilities/Utils.cs b/JL.Core/Utilities/Utils.cs
index d45a2811..60a16062 100644
--- a/JL.Core/Utilities/Utils.cs
+++ b/JL.Core/Utilities/Utils.cs
@@ -1,3 +1,4 @@
+using System.Buffers;
 using System.Collections.Frozen;
 using System.Globalization;
 using System.Security.Cryptography;
@@ -249,4 +250,6 @@ public static string GetPath(string path)
 
         return concatArray;
     }
+
+    public static readonly SearchValues<string> ValidYomichanFileSuffixes = SearchValues.Create(["term", "kanji"], StringComparison.Ordinal);
 }
diff --git a/JL.Windows/GUI/AddDictionaryWindow.xaml.cs b/JL.Windows/GUI/AddDictionaryWindow.xaml.cs
index 42233ec2..8444ef49 100644
--- a/JL.Windows/GUI/AddDictionaryWindow.xaml.cs
+++ b/JL.Windows/GUI/AddDictionaryWindow.xaml.cs
@@ -78,7 +78,7 @@ private void SaveButton_Click(object sender, RoutedEventArgs e)
             else
             {
                 bool validPath = Directory.EnumerateFiles(fullPath, "*_bank_*.json", SearchOption.TopDirectoryOnly)
-                    .Any(static s => s.Contains("term", StringComparison.Ordinal) || s.Contains("kanji", StringComparison.Ordinal));
+                    .Any(static s => Utils.ValidYomichanFileSuffixes.Contains(s));
 
                 if (!validPath)
                 {
diff --git a/JL.Windows/GUI/AddFrequencyWindow.xaml.cs b/JL.Windows/GUI/AddFrequencyWindow.xaml.cs
index ceae13ea..208e1de8 100644
--- a/JL.Windows/GUI/AddFrequencyWindow.xaml.cs
+++ b/JL.Windows/GUI/AddFrequencyWindow.xaml.cs
@@ -66,7 +66,7 @@ private void SaveButton_Click(object sender, RoutedEventArgs e)
         if (type is FreqType.Yomichan or FreqType.YomichanKanji)
         {
             bool validPath = Directory.EnumerateFiles(fullPath, "*_bank_*.json", SearchOption.TopDirectoryOnly)
-                .Any(static s => s.Contains("term", StringComparison.Ordinal) || s.Contains("kanji", StringComparison.Ordinal));
+                .Any(static s => Utils.ValidYomichanFileSuffixes.Contains(s));
 
             if (!validPath)
             {
diff --git a/JL.Windows/GUI/EditDictionaryWindow.xaml.cs b/JL.Windows/GUI/EditDictionaryWindow.xaml.cs
index 6693b869..8bb966fb 100644
--- a/JL.Windows/GUI/EditDictionaryWindow.xaml.cs
+++ b/JL.Windows/GUI/EditDictionaryWindow.xaml.cs
@@ -79,7 +79,7 @@ private void SaveButton_Click(object sender, RoutedEventArgs e)
                 else
                 {
                     bool validPath = Directory.EnumerateFiles(fullPath, "*_bank_*.json", SearchOption.TopDirectoryOnly)
-                        .Any(static s => s.Contains("term", StringComparison.Ordinal) || s.Contains("kanji", StringComparison.Ordinal));
+                        .Any(static s => Utils.ValidYomichanFileSuffixes.Contains(s));
 
                     if (!validPath)
                     {
diff --git a/JL.Windows/GUI/EditFrequencyWindow.xaml.cs b/JL.Windows/GUI/EditFrequencyWindow.xaml.cs
index fa6397e8..1bba6cd7 100644
--- a/JL.Windows/GUI/EditFrequencyWindow.xaml.cs
+++ b/JL.Windows/GUI/EditFrequencyWindow.xaml.cs
@@ -66,7 +66,7 @@ private void SaveButton_Click(object sender, RoutedEventArgs e)
             if (_freq.Type is FreqType.Yomichan or FreqType.YomichanKanji)
             {
                 bool hasValidFiles = Directory.EnumerateFiles(fullPath, "*_bank_*.json", SearchOption.TopDirectoryOnly)
-                    .Any(static s => s.Contains("term", StringComparison.Ordinal) || s.Contains("kanji", StringComparison.Ordinal));
+                    .Any(static s => Utils.ValidYomichanFileSuffixes.Contains(s));
 
                 if (!hasValidFiles)
                 {
diff --git a/JL.Windows/Utilities/KeyGestureUtils.cs b/JL.Windows/Utilities/KeyGestureUtils.cs
index 598bc624..94380c38 100644
--- a/JL.Windows/Utilities/KeyGestureUtils.cs
+++ b/JL.Windows/Utilities/KeyGestureUtils.cs
@@ -1,3 +1,4 @@
+using System.Buffers;
 using System.Collections.Frozen;
 using System.Text;
 using System.Windows.Controls;
@@ -10,6 +11,8 @@ namespace JL.Windows.Utilities;
 
 internal static class KeyGestureUtils
 {
+    private static readonly SearchValues<string> s_validModifiers = SearchValues.Create(["Ctrl", "Alt", "Shift"], StringComparison.Ordinal);
+
     public static readonly OrderedDictionary<string, KeyGesture> GlobalKeyGestureNameToKeyGestureDict = [];
 
     public static readonly KeyGesture AltF4KeyGesture = new(Key.F4, ModifierKeys.Alt);
@@ -174,9 +177,7 @@ public static KeyGesture GetKeyGestureFromConfig(SqliteConnection connection, st
         {
             KeyGestureConverter keyGestureConverter = new();
 
-            string keyGestureString = rawKeyGesture.Contains("Ctrl", StringComparison.Ordinal)
-                                      || rawKeyGesture.Contains("Alt", StringComparison.Ordinal)
-                                      || rawKeyGesture.Contains("Shift", StringComparison.Ordinal)
+            string keyGestureString = s_validModifiers.Contains(rawKeyGesture)
                 ? rawKeyGesture
                 : $"Win+{rawKeyGesture}";