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