Then I learned to use location in Objective-C, especially in background. When I was about to finish, Apple announced Swift, so I created a few small apps in it, but unfortunately from the beta Xcode it's not allowed to publish them to the Store yet.
One of the apps was a database of address points in the Czech Republic. Because I needed various kinds of data, I "accidentaly" found a new source of such data for QetriX. I started just with EU (NUTS and LAU areas), but expanded to the US as well. Instead of importing from TSV right into QetriX, this time I imported it from source CSV to custom table. I hope I would be able to see the data better (because of SQL JOINs and such).
For the mobile app of CZ Address Points I created a QetriX based website. Because it involved some CSS, I also updated reference pages for grid and "friendly" colors - consisting only from pairs of 0, 3, 6, 9, C and F hex numbers.
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| QetriX Friendly Colors |
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| QetriX Grid |


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