Image:Undergravel filter.png

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[edit] Summary

• Drawing by David Midgley.

[edit] Licensing

I, the copyright holder of this work, hereby publish it under the following licenses: Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. This work is licensed under the Creative Commons Attribution 2.5 License. You may select the license of your choice.

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