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Fold and unfold along the diagonals
Fold and unfold each corner to the center
Turn over
Fold in half and unfold
Fold the top edge to the center and unfold
Fold the bottom edge to the center and unfold
Fold the left edge to where the creases intersect and unfold
Repeat on the right side
Turn over
Bring the sides and top down making a waterbomb base
Bring the bottom up and squash-fold
Repeat behind
Fold along the existing crease and squash-fold
Unfold
Repeat on the right side
Repeat behind
One unit finished Make 12 units
Insert one unit into the other, matching the points indicated as 1 and 2
Make sure the point goes to the middle of the other unit
Connect all the units the same way
Reverse-fold the corners, except the first and last
Repeat on the other side
Fold the edge up between the units
Repeat on the other side
Connect the first and the last units
Lock them together the same way we did with the other units
Reinforce and adjust the folds if necessary
Fireworks finished!