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