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