Step 8
: Fold as shown below.
Step 9
: Fold on the crease made in step 7.
Step 10
: Make a crease as shown below.
Step 11
: Fold behind as shown below.
Step 12
: Pull out as far as possible and fold up.
Step 13
: Make a crease so that（A）is aligned with the line between（B）and（C）,then unfold.The picture with red X in the figure below shows the wrong folding.,with the green V shows the right folding.
