Based on Minetest Game mod: stairs
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Authors of source code
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Originally by Kahrl <kahrl@gmx.net> (LGPLv2.1+) and
celeron55, Perttu Ahola <celeron55@gmail.com> (LGPLv2.1+)
Various Minetest developers and contributors (LGPLv2.1+)

http://www.gnu.org/licenses/lgpl-2.1.html

License of media (textures and sounds)
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Attribution-ShareAlike 3.0 Unported (CC BY-SA 3.0)
http://creativecommons.org/licenses/by-sa/3.0/

Note: This mod has been amended to add new features like transparent and glowing
stairs, sloped stairs, recipes to return stairs back into blocks and also to be
used as fuel for furnaces, and alternative placement functions that use
on_rotate and sneak key.