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