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Short answer
You have the two equations you need on the linked page under the heading "Stage two":
#1: Attribution notice removed
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System
·
2020-06-01T14:13:52Z (almost 5 years ago)
Source: https://worldbuilding.stackexchange.com/a/79653 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/