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