diff --git a/AoC_2025/Day08.cs b/AoC_2025/Day08.cs
index 22f3284..374c91f 100644
--- a/AoC_2025/Day08.cs
+++ b/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();
-        return enumerated
-            .SelectMany((valueA, ix) => enumerated.Skip(ix + 1).Select(valueB => (valueA, valueB)));
+        var enumeratedValues = values.Index().ToArray();
+        var pairs = 
+            from a in enumeratedValues
+            from b in enumeratedValues
+            where a.Index < b.Index
+            select (a.Item, b.Item);
+        return pairs;
     }
 }
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