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