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Picked one by one from a mixed channel. Transcript check: both title readers certain; 5 of 5 sampled certain picks confirmed by transcript, none failed. Channel rule: Include only the numbered course series (basic electronics, Arduino, oscilloscope, block programming), explicit technical tutorials (PCB design, circuit calculations, component testing, module usage), and repair or technique demonstrations whose titles are plainly descriptive. Exclude product reviews, sponsored installs, podcasts and opinion pieces, kit recommendations, and any title with alarm or clickbait styling.