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