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