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