It's Adventure Time!

This is a clone of the board game Mastermind.

Objective: find the right combination of Adventure Time characters within 10 attempts.

For example, 

(Finn, Finn, Bmo, Ice King) 

or 

(Treetrunks, Jake, Gunther, LSP). 

Duplicate characters are allowed.

Choose a combination by clicking and changing the character faces then click Peppermint Butler to make an attempt. The combination will appear in one of the 10 blue lines above along with two numbers. The first number represents the number of correctly chosen characters in the correct positions. The second number represents the number of correctly chosen characters in the wrong positions.

Use these clues to deduce the correct combination!

Algebraic!