Woven silk pyjamas exchanged for blue quartz | osp blog

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Woven silk pyjamas exchanged for blue quartz

Instead of using the usual The Quick Brown Fox jumped over the lazy dog, this rather absurd text is set as default in Scribus Font Preview:

scribus
preview

I wonder who decided to use this particular sentence, and why?
Alternative pangrams to choose from: http://users.tinyonline.co.uk/gswithenbank/pangrams.htm