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