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Pen is cheap and easy to get. But it is not the same for the people who are in areas with poor educational environment.
Of course they would be able to purchase pen at cheap price. But they may have to walk 1000M~10000M to get it when we have to just walk only 100M.
Self-supporting pen will enable them to use pen utilizing soot that is left from making the fire. Ashes left from the fire will be combined with proper amount of water to be used as a pen and this pen also has a chopper and filter to mash the lump to prevent residue. And scraps after using can be easily thrown away.
Incheon, South Korea