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