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