O. Parhizkari

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Sure, attached is an extract from a text book of Iranian high school chemistry book. A university textbook can also be found [here](http://www.aliafzalsamadi.ir/content/Chimie%20generale%20optimise.pdf). [029-058-C289-1.pdf](https://github.com/mhchem/MathJax-mhchem/files/4313972/029-058-C289-1.pdf)

In my older 32 bit linux I had no problem with MyPaint on my coreM laptop, while had some lagging stroke issue when the pen was bigger in size on...