Who can tell me how to type the lines in this book?

You need to prepare a needle and thread first. This thread is six times as long as this book. . Thread the thread through the needle, like sewing clothes, align the line segments, and don't tie the ends of the line segments. . The next step is to bind books.

First of all, there are four loopholes in the book. From top to bottom, the front numbers are 1, 2, 3, 4. The following numbers are 1b, 2b, 3b, 4b. (b stands for back)

Step 1: Put the needle through 2b, don't pull the thread to the end, leave some thread ends to make the final knot, then pass through 2b around the spine and tie it tightly.

Step 2: Go in from 3, pull out from 3b, go in from 3 and circle the spine, and tighten.

Step 3: put it in from 4b, pull it out from 4, put it in from 4b to bypass the spine of the book, tighten it, put it in from 4b to bypass the bottom of the book, and tighten it, thus completing the semi-binding. .

Next, bind the unthreaded part. .

Step 4, enter from 3, tighten, enter from 2b, tighten, enter from 1, tighten, and repeat step 3. .

Step 5: tie a knot. Step 4: The last stitch comes out at 1b, pull the stitch to 2b, pass under the tied thread, and then tie a knot with the thread end reserved at the beginning, tie two knots, and stick it to 2b hole as much as possible.

It's done.

This binding method is called four-eye binding.