It was the most uncertain of times, it was the least certain of times...
the tests for clarity can provide the opposite (but are better than nothing) https://twitter.com/zbinney_nflinj/status/1246037468501233664?s=21 https://twitter.com/zbinney_nflinj/status/1246037468501233664
another good thread on testing https://twitter.com/drjessicawatson/status/1245822031687532544?s=21 https://twitter.com/drjessicawatson/status/1245822031687532544
that features a calculator https://calculator.testingwisely.com/playground 
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