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Used to aid in data retention and processing via an internal cogitator implant. Vast quantities of [[satadata-slate]]s and parchments can be sifted through rapidly, amassing vast realms of data that can be applied to one's own intuition.{{Fn|31b}} The '''Calculus Logi Upgrade''' is typically reserved for the Adeptus Mechanicus. Several Tech-Priest sects consider this implant the most important first step towards fully embracing the [[Machine God]].{{Fn|33}}