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co-là-breithbirthdaymasculine noun
the
an co-là-breith
after a preposition
a' cho-là-breith
of the
a' cho-là-breith
plural
co-làithean-breith
the (plural)
na co-làithean-breith

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. Checked by a fluent speaker.

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