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