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leabharbookmasculine noun
the
an leabhar
after a preposition
an leabhar
of the
an leabhair
plural
leabhraichean
the (plural)
na leabhraichean

Every form but the headword, the genitive and the plural is worked out by the spelling rules in the grammar guide, so what you see here is what the guide teaches. Awaiting a fluent speaker’s review.