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Examples of various publication formats: 
ISBN 978-952-493-003-1 (softcoverpaperback)
ISBN 978-952-493-004-8 (PDF)

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ISBN 978-951-45-9693-3 (hardcover)
ISBN 978-951-45-9694-0 (softcoverpaperback)
ISBN 978-951-45-9695-7 (PDF)
ISBN 978-951-45-9696-4 (EPUB without DRM)
ISBN 978-951-45-9999-5 (EPUB with ACS4 DRM)

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