I'm a sophomore in high school .. I forgot all the knowledge of grade three!

However, I remember that there are triangles in mathematics, so your hard card is made into a card with two triangles. Then, if you are good at drawing, you can draw a teacher with another cardboard, and then teach or discipline a student. Color it, cut it out with scissors, and then stick it on a triangle-like card! If you are not a good painter, you will have to go to the store to find it. ..