Write the next sentence in this paragraph:

How to patch a damaged hardwood floor
Determine the size of the pieces you need to replace.
Locate a threshold or a heat register and lift it out. Measure the thickness and width of the board.

Pick from: a. If the pieces meet these measurements, they should fit perfectly together. In most cases, the board should be roughly 4'-13' wide, and 12 inches (30 cm) high. b. Next measure the length of the piece you want to remove. Visit a lumberyard, home-improvement store, floor-covering store or mill workshop. c. If you have no resistance or trouble lifting it out of the ground, the heat register and heat register fuse. You may need to remove any electrical outlets that have not been removed. d. It should fit snugly into the joints of the boards on either side. In most cases, one piece should fit snugly in between the pieces, while the other piece should comfortably sit sideways between the boards.
b.