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