The tree starts as a single region covering the whole space. As points arrive, they get dropped into the region that contains them. When a region exceeds its capacity (the maximum number of points it can hold before splitting), the region divides into four children, and the existing points get redistributed.
Россиянам станет тяжелее снять наличные08:49
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One case I left aside was the canton of Valais.
(logging all transactions) or filling in pre-printed forms such as receipts