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