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