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