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