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