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