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