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