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