Your goal is to find the secret four-color code. The following colors are possible: black, white, brown, yellow, blue, red.
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: ['white', 'red', 'blue', 'black']. Hint: two colors are in the secret code but in the wrong positions.
Guess: ['black', 'brown', 'red', 'brown']. Hint: two colors are in the secret code but in the wrong positions.
Guess: ['yellow', 'black', 'white', 'red']. Hint: two colors are in the secret code but in the wrong positions.
Guess: ['brown', 'yellow', 'black', 'blue']. Hint: two colors are in the correct positions and two colors are in the secret code but in the wrong positions.
A B C D
black, blue, red, brown red, blue, brown, yellow yellow, black, black, blue brown, blue, black, yellow