[17]
Repeat step 14. Make sure that edges CB and AB are aligned with edges XY and XA.
[18]
Valley fold
as shown. The fold line begins at point Y and runs parallel to edge AC.
[19]
Turn the model over.
[20]
Repeat step 18. Note: the edge created in this step (edge AB) should be in line with the edge created in step 18.
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