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