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sùileyefeminine noun
the
an t-sùil
after a preposition
an t-sùil
of the
na sùla
plural
sùilean
the (plural)
na sùilean

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.