this enigma has a particular functioning.
2 different screens may appear :
+ The 1st has marks on the B, C and F keys.
+ The second, the A, D and E keys.
For the following explanations, I will take the example of the BCF pattern.
You should know that a function in the program prevents you from finding it the first time. If by chance you enter the correct combination the first time, the game tells you that you made a mistake and the correct answer is redetermined by the program. Players succeeding the second time do not know it but they achieve a perfect.
Next :
The game talks about 6 possible combinations but that's a "lie".
In reality I have eliminated the back and forth combinations of the possibilities (BCF and FBC). It is very often the combinations that are tried first by the players.
So we are left with 4 real possibilities (BFC, CBF, CFB and FBC).
Obtaining this puzzle would amount to entering one of these 4 to pass the false first try stage as quickly as possible and really start the puzzle. In short, knowing all this, the number of possibilities by in reality from 6 to 3.
I chose to program this puzzle this way to create an illusion of challenge. I found it ridiculous at the time of the tests to arrive at this enigma and that sometimes the most obvious of the 6 combinations was the right ones the first time.
I am French and I translate on google. I hope it can help despite my bad English.