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