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