9. (18 points) A square piece of paper, if folded 2 times, folded into a small square, and a notch is cut on each side of this small square, when the paper is unfolded, there are 4 small holes in the middle of the paper (notches on the edges do not count). A square piece of paper, if folded 6 times into a small square, and a notch is cut on each side of this small square, and then the paper is unfolded, there will be $\qquad$ small holes in the middle of the paper.
【Answer】Solution: According to the analysis, after folding 6 times, the paper is divided into an $8 \times 8$ grid. Apart from the edges on the outside of the paper,

each inner edge of the grid has a hole. The $8 \times 8$ grid inside the paper has a total of: $(8 \times 8 \times 4 - 8 \times 4) \div 2 = 112$ edges, with one hole on each edge, so there are 112 holes in total.

Therefore, the answer is: 112.