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