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