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