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