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