[
    "(right (right (left 1 (1x2 (right 10 (1x2 (left 9 (2x1 (right 2 (2x1 (right 6 (2x1 (left 2 (2x1 (left 6 (2x1 (right 4 (2x1 (right 4 (2x1 (left 6 (2x1 (right 4 (2x1 (left 6)))))))))))))))))))))))))"
]