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