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