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