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