Yesterday, the best answer is: fix(x^2)^2.  (Contributed by anid. Good Job!)
dnialh solved the puzzle at 20:00:30.341; length: 9
dnialh solved the puzzle at 20:00:37.775; length: 9
dnialh solved the puzzle at 20:00:54.621; length: 8
dnialh solved the puzzle at 20:01:21.314; length: 9
fire solved the puzzle at 21:17:28.042; length: 8