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Manually.

But boy, he talks fast!

It's a very short video though, so no problem there, but I hope he'll include these in new editions of this back and forth communication :)

Oh did you know you can copy paste it from YouTube? Open Transcript if it is available. Or use downsub.com but then you have to get rid of the html tags. sed 's/<(^<)>//g' will do IIRC or check regexr.com