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