Your goal is to find the secret four-color code. The following colors are possible: black, brown, green, blue, yellow, purple.
Some guesses have already been made. I will provide feedback for each guess made with which it is possible to unambigiously determine the secret code.

Previous Guesses:
Guess: ['yellow', 'green', 'black', 'purple']. Hint: two colors are in the secret code but in the wrong positions.
Guess: ['black', 'brown', 'brown', 'green']. Hint: two colors are in the correct positions.
Guess: ['black', 'brown', 'blue', 'yellow']. Hint: two colors are in the correct positions.
Guess: ['black', 'black', 'blue', 'green']. Hint: two colors are in the correct positions.
A B C D
green, brown, green, black green, yellow, brown, yellow yellow, black, black, purple purple, brown, blue, green