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