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