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