Refactor Day08 to improve readability with LINQ

AoC_2025/Day08.cs

@@ -123,10 +123,14 @@ public class Day08
         return combinations;
     }
 
-    private IEnumerable<(TValue a, TValue b)> Combinations<TValue>(IEnumerable<TValue> values)
+    private IEnumerable<(TValue a, TValue b)> Combinations<TValue>(IEnumerable<TValue> values) where TValue:IComparable
     {
-        var enumerated = values.ToArray();
+        var enumeratedValues = values.Index().ToArray();
-        return enumerated
+        var pairs = 
-            .SelectMany((valueA, ix) => enumerated.Skip(ix + 1).Select(valueB => (valueA, valueB)));
+            from a in enumeratedValues
+            from b in enumeratedValues
+            where a.Index < b.Index
+            select (a.Item, b.Item);
+        return pairs;
     }
 }