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