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Series taking place in the same universe. Some series can be part of different universes.
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A series can have several editions: by country, language, reprints, etc.
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Common denominator that defines a unity (e.g. title and book number).
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People, group, cercle or company who worked on a book, a edition or series.
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Personnage d’une séries.
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Compagny editing or distributing a book or series.
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Books added since the 7 last days.
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Birthdays of people, group, cercle or company and series.
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Exchange rate between two currencies.