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