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