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