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How to make a cube or a parallelepiped with a concave facet
All the steps to make a cube or a parallelepiped with a concave facet with a sheet of paper.
| 1
The shape is printed, grooved and cut off. 
| 2
Without folding flaps, blend the face delimited by the arrows, then, fold carefully the folds. Fold the folds at the level of the arrows heads. 
| 3
Glue the flap. 
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| 4
Close the shape following the movement shown by the arrow. 
| 5
Fold the flaps of the concave area. 
| 6
Glue the flaps. 
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| 7
Fold down the facet following the movement shown by the arrow. 
| 8
Glue the flaps. 
| 9
Fold down the facet following the movement shown by the arrow. 
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| 10
The parallelepiped with a concave facet is finished, at the asked size. 
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