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