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