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