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