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