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sgoilschoolfeminine noun
the
an sgoil
after a preposition
an sgoil
of the
na sgoile
plural
sgoiltean
the (plural)
na sgoiltean

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.