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