9 Valley-fold diagonal 45-degree creases, crossing at the center, unfolding after each. 10 Study the lettermarked creases and look ahead at the next step for the shape. Use the existing creases to mountain and valley-fold the bill and collapse it into shape. 11 Valley-fold the indicated ends of the bill to meet at the middle.
12 Unfold. You can make Step 13 easier if you flex these folds back and forth. 13 Use the existing creases to push the ends into the bill. 14 Begin assembly by inserting one of the two first bills into the third bill as shown. Complete assembly by adding the second copy of your first two bills on the other side and in the same manner.