2. After unfolding, the two corners of the bottom edge are folded in half, the upper and lower sides are folded in half, and then folded in half.
3. Fold back along the crease, fold two small corners, unfold the side, and fold back along the crease.
4. Fold the two sides in half to the middle, the small corner in the middle, the small corner above and the bottom of the heart in half.