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