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