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How it works

1. Open a PDF from your phone or tablet — it stays in this browser.
2. Read it. Slide a finger along a line to highlight it — slide back across the mark to rub it out.
3. Tap a word or a paragraph to have it explained, in the book's own context.

Explaining is the paid part: buy a key ($3 a month, $29 a year), then paste it into License to unlock this device.