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