Hello all! So I have been working with this board that I jointed together, and after starting to plane I noticed that there were several of these "holes" (not sure what the technical term is here) along the board. As I planned across the board, they would close up in some spots, but in others it was a lot harder to get them to go away, even with thicker shavers. So my question is, is it possible to use my hand planes to get rid of these holes in the wood, and would it be advisable? I have a Jointer, no.5, and no.4 at my disposal to use. I can add more information as needed but not sure what else to include for now. Thanks all!