How to make a folding knife out of A4 paper

Origami instructions on how to make a folding folding knife with your own hands from a regular sheet of A4 paper. Required: 1 sheet of A4 paper. Of course, it should be borne in mind that this is not a masterpiece of Damascus steel, but just a banal paper craft. But still, and our knife has one inherent feature that allows it to stand out from other paper knives, the fact is that it is a folding knife, with a little manual force and the blade can be easily hidden inside the handle. Such manipulation in real life makes it very safe to carry a real edged weapon in an ordinary pocket, without fear of injury from an accidental fall or sudden movement of the hands. In our case, we only repeat this principle in our origami crafts, adults are unlikely to be interested, but boys, believe me, they will be extremely interested. After all, who in his youth from the guys was not fond of weapons, and remember this unbridled desire to hold it in your hands. But moral parents are right there, they can’t, and t