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