diff --git a/BullCowGame/FBullCowGame.cpp b/BullCowGame/FBullCowGame.cpp
index be7f169..4b46a0c 100644
--- a/BullCowGame/FBullCowGame.cpp
+++ b/BullCowGame/FBullCowGame.cpp
@@ -82,12 +82,18 @@ FBullCowCount FBullCowGame::SubmitValidGuess(FString Guess)
 bool FBullCowGame::IsIsogram(FString Word) const
 {
 	// treat 0 and 1 letter words as isograms
+	if (Word.length() <= 1) { return true; }
 
-	// loop through all the letters of the word
-		// if the letter is in the map
-			// we do NOT have an isogram
-		// otherwise
-			// add the letter to the map as seen
+	TMap<char, bool> LetterSeen; // setup our map
+	for (auto Letter : Word) 	// for all letters of the word
+	{
+		Letter = tolower(Letter); // handle mixed case
+		if (LetterSeen[Letter]) {// if the letter is in the map
+			return false; // we do NOT have an isogram
+		} else { 
+			LetterSeen[Letter] = true;// add the letter to the map
+		}	
+	}
 
 	return true; // for example in cases where /0 is entered
 }
diff --git a/BullCowGame/FBullCowGame.h b/BullCowGame/FBullCowGame.h
index e6f9591..9f3ce0d 100644
--- a/BullCowGame/FBullCowGame.h
+++ b/BullCowGame/FBullCowGame.h
@@ -36,6 +36,7 @@ class FBullCowGame
 	void Reset(); // TODO make a more rich return value.
 	FBullCowCount SubmitValidGuess(FString);
 
+
 // ^^ Please try and ignore this and focus on the interface above ^^
 private:
 	// see constructor for initialisation
diff --git a/Section_02.VC.db b/Section_02.VC.db
index df1017c..8059dc0 100644
Binary files a/Section_02.VC.db and b/Section_02.VC.db differ