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