If you use Pythagorean theorem on a right triangle with 0.05" sides, the hypotenuse has a side of 0.07071" which is close enough for our use (targetting 0.07"). From the first pin to the 16th pin, that's only off by about 0.01" total which is smaller than the size of a hole.
p.s. Each five consecutive pins in a row are connected, but due to the shape of the STM8 SDIP it appears that none of the cpus pins get shorted together.
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