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