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