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