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